Well, I don't really count this as headcanon, since it's canon that he did it with the females when they were little, but I figure he does the same thing with his kids. He would get on all fours and chase the girls around the campfire, pretending to be a bear.

As for other stuff, it's not uncommon for Fonrar and him to be asleep, and when the hatchlings wake up before them and crawl up, to end up as one big pile, just like human families.

The hatchlings are only a month old, so they don't really do much yet. :D;