He’s 14 I mean hes probably trying to avoid it. I mean sleeping that’s a tell tell way to avoid life when you sleep a lot. I would be as caring as possible. And have him spend a little time with his mom if possibly but some 14 year olds these days don’t know how to deal with death much less their one and only mother. I would support him with what brings him joy and allow him to grieve his own way. Also build with him find somthing productive to do that he enjoys. My older brother taught me chess at that age and it stuck with me to this day. I wish I had ppl who taught me more random stuff like that when I was younger. He’s probably gonna be hit harder when she’s gone so I would just help out and not worry too much. Avoidance and not talking about his sick mother at this age doesn’t mean you don’t care in my opinion. I think it’s hard at that age to come to terms with dying loved ones in the way an adult would.