Kane Leary, 17, died in hospital when his life support was turned off Sunday night following the crash on Thursday evening, while Daniel Rivette, 16, remains in the Launceston General Hospital with fractures to his legs and arms.

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The pair were riding a trail bike on Tompsons Lane, Newnham, when it was involved in a crash with a ute.

Daniel's father, Scott Rivette, said the families had been dealing with the uncertainty about their children's critical injuries when comments on social media started apportioning blame, including to the parents.

"How would you feel in the families' shoes? Have a think about what the parents are going through," he said.

"It's not just the families either, there's a lot of people coming through the hospital to see him, lots of friends and other families out there dealing with this.

"They say this stuff on Facebook, like 'they deserved it', 'where were the parents', stuff like that. For Christ's sake, don't bad mouth these families, we're going through so much at the moment.

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"I was just trying to hold myself together, then you see all these comments on Facebook."

Since arriving at the LGH, Daniel has undergone surgery and was likely to remain in hospital for some time.

Limited visited hours have also made things more difficult for family and friends.

Kane's loved ones have paid tribute to Kane on Facebook, and his sister established a GoFundMe to assist with upcoming costs.

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Mr Rivette said Daniel still had a long way to go.

"He's still looking up at me and saying he's sorry for what happened," he said.

"He's got bad fractures in his leg and arm, but the worst is his head that never got touched physically. He's lost his mate, it's devastating."

Following the crash, Tasmania Police released a statement claiming the motorcycle did not have headlights and the boys were not wearing helmets. Family members have disputed aspects of this statement.

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