As others have said, it's individual to that particular family. And can even vary within that family.
At my mother's funeral, I spent most of the time fuming. Mum had spent the last 10 years of her life alone, except for family, yet 100's turned up for her funeral, but never came round when she was disabled.
My adult child hated the whole thing. Didn't want to share their feelings and memories of Mum with others. They felt very differently about the internment of Mums ashes, which adult child felt was cathartic and personal.
Sister found the ceremony comforting, knowing that so many remembered the contribution Mum had made to her community.
So, three opinions from the same family. So who knows what the answer is?
I've told my adult child that when I die, they must do whatever feels right for them, not for others. As far as I'm concerned, my child will be the main person. Selfish? Probably