Helping Daughter's Boyfriend

I've just recently learned that my daughter's boyfriend's (21) mom and dad BOTH have used his name in utility bills (and who knows what else) in Indiana and Arizona and not paid them.

He has a very complicated family life. His dad is in jail for unknown reasons and his mom is dying of cancer. He found out about a year ago (I think) that these bills were in his name and has just been paying on them because he doesn't want his mom to get into trouble.

I need to help this kid get out from under this debt. He doesn't want to go after his mom on her death bed and have his family be pissed at him because he doesn't have much left and he doesn't think they will understand.

At the very least I told him to go after his dad. The problem is, he's been paying on this stuff for so long after finding out that it would seem he's already legally taken responsibility for the debt despite probably not even being in high school when this happened. (Also, how the F can this be a thing that can happen when it's obvious with birthdays that someone isn't even old enough to get a job or pay bills?!)

He can't afford a lawyer and neither can I. I've told him to get all the information around specifically for his dad and the debt associated with him so that we can file a police report for identity theft.

I don't know what else to do. I've told him I will go with him to everything and be present for any phone calls to ask questions but how can I help this kid get out from under the shit his parents did to him? He's a good kid and needs a win.

Location: Michigan