Image source, US Pool

Craig Shilling, the father of victim Justin Shilling, 17, is giving his victim impact statement - he notes it is the second time he's done so in six months.

He says no one should ever have to give such statements. The fact the victims speaking today were doing so for the second time "speaks volumes".

He says he has experienced uncontrolled emotional outbreaks, sleepless nights; he lives every day with "pain, anger, heartache, regret, anxiety and stress".

"The wounds are still as fresh as they were on that tragic day."

He wears a hoodie with a picture of his son on the front.

Image source, US Pool

Jill Soave, the mother of Justin Shilling, was the second parent to deliver their victim impact statement.

"My horror and trauma is hard to put into words," she said.

Soave described her middle child, 17, as "the best son any mother could pray for", noting his bravery in trying to protect his fellow students in his final moments.

Looking at James and Jennifer Crumbley, she slammed them for their "failure to act" and stop a "completely preventable" tragedy.

"If only they had done something, anything, to shift the course of events," she said.

Instead of "abandoning [their son] at school", the Crumbleys could have taken him to counselling or checked his bag or secured their firearm, she noted.

"It doesn't appear either of you even wanted or cherished your son, but I wanted and cherished mine," she said.

She called on Judge Matthews to impose the harshest possible sentence - which she said would not be enough.

Madisyn's mother Nicole says the fact the Crumbleys were shaking their heads during the verdicts "is the upmost most disrespectful thing I have ever witnessed".

"You decided parenting wasn't a priority - putting your child first should be the only priority," she says.

"You didn't and because of that I've lost my daughter."

Nicole says when she went to identify her daughter, "her body was in a state I couldn't imagine".

She asks the judge for the maximum sentence to be enforced, but says it would "never compare to the live sentence I've been given".

Madisyn Baldwin's mother is now addressing the Crumbleys.

"While your son was hearing voices and asking help, I was helping Madisyn pick out her senior classes," Nicole Beausoleil says while crying.

"When you were purchasing a gun for your son and leaving it unlocked, I was helping her finish her college essay.

"When you texted Ethan don't do it, I was texting Madisyn 'I love you please call mom.'"

Nicole Beausoleil, mother of 17-year-old victim Madisyn Baldwin, begins giving her victim impact statement.

"I want to start with person that matters the most, Madisyn. She was a kind soul, she had a smile that could light up a room when she walked in, a laugh I could listen to all day; her big sister skills were undeniable," she says.

Nicole says her daughter, who was 17, would talk about college and what she'd like to study, before she was shot and killed.

She says on the day that Madisyn was shot, she broke her "first promise as her mum - I didn't protect her".

She thanks the prosecution team.

Prosecutors are seeking between 10 and 15 years in prison for James and Jennifer Crumbley. Here is what we've heard so far:

• The Crumbleys objected to pre-sentencing paperwork that suggested they have drug and alcohol problems. Judge Matthews noted that Jennifer did not have a drug problem, but that James used cannabis daily and drank heavily.
• Prosecutors proposed a no-contact order between James, Jennifer and Ethan Crumbley, their son. Defence lawyers said this would be unfair. The judge will rule at a later date
• Defence lawyers contended that the Crumbleys were responsible for "one grossly negligent act" rather than four separate criminal acts. The judge agreed with prosecutors that this would be akin to acting as if only one child was shot dead.
• Defence lawyers also claimed the media had spread a false narrative about the case, but the judge said that it was the Crumbleys who "brought the circus" to Detroit
• James Crumbley's expletive-laden threats against lead prosecutor Karen McDonald were read out by the prosecution.

Image source, Getty Images

The court is taking a short break, after which victim impact statements are expected to be read out.

We will bring you the latest from the courtroom here - you can also watch the proceedings live from Michigan by pressing play at the top of this page - there may be strong language that some may find offensive.

There may also be upsetting moments, do follow this page with care.

James Crumbley's lawyer, Mariell Lehman, meanwhile states that her client "never threatened to physically harm" Karen McDonald, the lead prosecutor in this case.

He "vented" and used language that was "angry" and "not respectful", she claims.

Oakland County Assistant Prosecuting Attorney Marc Keast then reads out the profanity-laden statements made by the defendant about McDonald.

"I didn't want to read that, your honour," he says. “I don’t know any other purpose for what James Crumbley did that other than to interfere with the administration of justice.”

Jennifer Crumbley's lawyer raised another objection with the sentencing guidelines, which address the offenders "intent to kill or injure another individual".

Lawyer Shannon Smith says Jennifer Crumbley "did not have intent or kill another individual, even if she was grossly negligent, and found guilty of that".

"We know who did have intent, and that's the shooter," Smith says.

James Crumbley's lawyer says that there was no evidence presented during the trial that his client was aware of his son's plans.

Shannon Smith has argued that prosecutors have helped create a false depiction of the Crumbleys that has been spread by media outlets reporting on the case.

Smith says that, when police were searching for the Crumbleys, they did not eventually find the pair in "an abandoned warehouse", but in a building that contained retail and non-retail stores.

She adds that the pair were not found "crouching on a mattress" but were simply laying on it.

When Judge Matthews interjects to ask why that matters, a frustrated Smith says that the media has created a false narrative of the case.

The judge responds: "I can't control the media, trust me."

She also says that, while it remains unclear whether they sought to flee the state, the Crumbleys were responsible for their own conduct.

"They brought the circus to the city of Detroit. They did," she said firmly.

A short while ago, the Crumbley's lawyers asked the judge to lift a no-contact order placed on James, Jennifer and their son Ethan, the gunman.

Lawyer Shannon Smith argued that "they have a constitutional right to be a family" despite having "felonies on their records".

Oakland County Assistant Prosecuting Attorney Marc Keast asked for time to respond, to which the judge gave them a week.

The pair's defence lawyers have been making a series of objections since the hearing began.

Each has just argued that, while prosecutors are making their sentencing recommendations based on four separate counts of involuntary manslaughter, neither parent committed four separate criminal acts.

Shannon Smith, representing Jennifer Crumbley, raises the objection, with a lengthy explanation that, while there was no legal precedent for this case, she was not responsible for each death that her son - charged as an adult - decided to commit.

Mariell Lehman, representing James Crumbley, agrees, saying that the gunman's father was responsible for only "one grossly negligent act that resulted in four deaths".

"I’m not trying to be callous to anyone, your honour," she adds.

Prosecutors dismiss this argument, saying that the Crumbleys do not get to pretend three other children had not died at the hands of their son. Judge Matthews agrees with this.

Image source, Getty Images

During James Crumbley's trial, the court heard that he made profanity-laden calls from Oakland County Jail, where he's been awaiting sentencing for involuntary manslaughter.

He allegedly threatened prosecutors during some of the calls, which they said is evidence that he has shown a "total lack of remorse".

"Defendant's jail calls showed that he blamed everyone but himself for what happened and that he repeatedly referred to himself as being persecuted and considered himself a 'martyr'," according to a report by CBS news, external that quotes the recent court document.

While the legal arguments continue, here is some background on why the Crumbleys were charged in this landmark case.

Ethan Crumbley was with his father James when he bought the semi-automatic handgun used in the attack.

Hours before the shooting, James and Jennifer Crumbley were called into the school after teachers found a note by Ethan, including several drawings of guns and bloodied people alongside captions including "blood everywhere".

School officials wanted counselling for their son, but his parents refused, did not ask him whether he had the gun with him, or search his backpack.

Later that day, Jennifer Crumbley texted her son to say: "Ethan, don't do it." Minutes later her husband called police to report his gun was missing.

By then, the boy had already emerged from the school bathroom and opened fire on his fellow students.

It was also noted that, although the gun had been purchased legally, it "seems to have just been freely available" for the child's use.

Image source, Reuters

Judge Cheryl Matthews says each of the defendants will get an individual sentence today.

But before that, the judge says the court will hear impact statements from the victims. She says it will be in best interest of the victims that these are heard all at once.

Image source, US Pool

Oakland County Circuit Court Judge Cheryl Matthews kicked off the sentencing by informing the court that she is sick today.

Lawyers for each parent are now objecting to parts of the pre-sentencing paperwork that suggests each had a substance abuse problem.

James Crumbley's lawyer concedes that he does use cannabis but not on a daily basis as prosecutors have alleged.

Jennifer Crumbley's lawyer explains that receipts filed by prosecutors that show unusually large purchases of alcohol came before Thanksgiving, when the family were hosting family at home.

Image source, US Pool

The pair are sitting next to their lawyers - Mariell Lehman is representing James Crumbley while his wife Jennifer is being represented by Shannon Smith.

This is the first time the pair have been in the same courtroom for some time, since they had separate trials.

Stay with us as we bring you the latest updates from inside the courtroom.

You can also watch live by pressing Play at the top of this page.

Michigan's sentencing guidelines state there should be a maximum punishment of about seven years in jail for the charges faced by the Crumbleys.

However, prosecutors say that length of sentence is not strong enough - and are asking for 10 to 15 years for each parent, according to a memo they filed last week.

They say the state's guidelines do not account for the "severity of the circumstances" or the defendants' "total lack of remorse".

Jennifer Crumbley's legal team are asking that she be sentenced to time served and house arrest, while her husband's lawyers have asked for 28 months of prison - the amount of time he has already spent behind bars.

James and Jennifer Crumbley were tried in two separate trials, and today will be the first time they have been in the same room together since some extraordinary details about their relationship came out in court, CBS, the BBC's US partner, has reported.

James Crumbley's defence lawyer, Mariell Lehman, argued that he "had no idea that his son was having a hard time".

He did not testify, unlike his wife Jennifer, who took the stand during her trial and tried to blame her husband.

At her earlier trial, prosecutors presented evidence that Ethan Crumbley had wanted mental health help and complained of hallucinations, but said his parents did not get him treatment.

Jennifer Crumbley said on the stand that she did not think her son had mental health problems, and when she was questioned during her trial about Ethan reporting hallucinations months before the shooting, she said he was just “messing around.”

But the evidence showed that they had refused to take Ethan home from school on the day of the shooting as school officials suggested, after finding Ethan's drawings of a gun and bloody figures.

And they purchased Ethan the handgun he used just days before the shooting as an early Christmas present and failed to properly secure it.