We are having 21+ but the cousins that are of age will be seated with their parents. If we had a lot of younger kids I would consider having a 'kid' table.
I would seat adult children with their parents. My sister and I have been seated at 'singles tables' at weddings for cousins and such and we always have a miserable time. It's much better to put them with the people they know than strangers.
I had 17 kids ranging in age from 4 - 15 and I did a kids table, for the older kids/cousins, I sat them together - they are all so close and enjoy spending time with each other.
I may sit older cousins with each other the only young kids I will have is my FG and RG which are my sisters kids so they will sit with her
As far as kids, the only ones we are inviting are FHs nieces and nephews. The ten of them will be seated at a table together.
We're seating people with their peers, not their parents.
