I'm going to decide not to go to a funeral
Why wouldn't you go to a funeral?
I do not like funerals.
I understand how you feel, but it is important to be there for your family at a funeral. It would upset them if you did not go.
I don't care. The better for them.
I don't think it will be better for them. Funerals are for the people who knew the decease to comfort each other. It might make them feel better for them to know that you are there for them in this situation.