I don't understand the idea of not wanting children to go to funerals because people don't want them to be upset. I think it's fine for children to be upset, and to see adults upset, because death is upsetting. In fact, more than fine, I think it's really important. Emotionally healthy. To see that grief is real, that people are hurting, but that there is comfort in supporting each other.
I agree with this. Both my parents died since I’ve had kids. They have attended everything- wake (over several days, similar to Irish tradition), church, cemetery. From age 2 to 9. I have also hosted a “celebration of life” at my home after a dear friend died suddenly and prematurely.
It is absolutely fine for children to see that mum is upset, to ask questions about life and death, to practise their empathy. Funerals play an important part in the grieving process. They unite families, they make the bereaved feel like they are still part of a whole unit. I had to fly my family 22 hours on Boxing Day to attend my mother’s funeral. No regrets whatsoever.
To those who worry about children saying inappropriate things, I think they should turn their attention to the adults. I have old relatives with dementia, and stupid relatives with no excuse, who said much worse than all the children (there were dozens) combined.