When are you expected to attend a funeral?

So, a family member recently informed me that her boyfriends mother is really sick and may pass away soon(ish) and if that happens I will be expected to go to the funeral….

This is really sad news, and I wish the family well but…

I really HATE funerals alot, for many reasons

I don’t know the mother at all (I think I met her once), I’m not a friend of the family or part of their family so I don’t understand why I would be expected to go.

As I understand it a funeral is for friends and family to say goodbye to a loved one and reflect on their life.

I’m at a loss, I don’t know what to do about this. What do you think?