Is OTHER wrong in the post ? POST : So I'm torn between the opinion of my mother and my mother in law. Let me explain the situation. 

Last wednesday, my back hurt terribly. I couldn't walk, couldn't sit. I've honestly never experienced that kind of pain in my life (although I had a pretty painfree life, physically). I went to the doctor and he told me that it's a common kind of pain and it'll fix itself in about 6 weeks. He gave me painkillers and sent me home. I live with my family in law (due to college and mental health). 

Wednesday evening, my great grandfather died peacefully. He was 90+, religious and longed to go 'home' to his wife. He had been sick for a long time, it's a relief for him and for the family.

Here goes: I can barely do anything, the only time I sit is for dinner. I walk a lot, as it is supposed to help the pain. My mom doesn't see this, I call her but she doesn't see the pain I'm in. This morning I thought it was getting better, but I turned around too fast and now the pain is back.

My mom expects me to go to the funeral. This will be 3 hours by train and another half an hour by car. That's a one way trip, so it would be 7 hours total, without even the funeral itself. The funeral is thursday. I'm afraid it'll do no good, as it hurts me to sit for 15 minutes. My mother in law thinks I shouldn't go, my mom thinks I should.

Family is important and I wish I could go, only I don't know if me going is a good idea. I didn't know my great grandfather too well, but he was an incredible man. My mom would be go crazy if I couldn't make it. 

Would I be the asshole?