I spoke to my dad about his funeral shortly before he died and was so glad I had. No one else in the family wanted to have that conversation, but it made everything so much easier when the time came.
About 9 months later the local University arranged a Memorial event for my dad (he was quite well known in his field) and we (the family) were not consulted at all, just invited! My mother was really upset and angry.
Tread carefully around funeral wishes.