A coop PvE game for two dads and three sons?
A shooter, preferably. Any recommendations, #mastodon guys? The youngest lad is 10, so as little violence as possible. Thanks 😉
Valheim is also capable of being extremely frustrating, so I'd recommend one of the mods that removes the skill penalty loss when dying. It might not be necessary, but dad knows the kids' temperaments better than me.
EpicLoot might also be good, if OP's kids are keen to grind components.
I'd recommend EpicLoot anyway. The effects it adds to some gear is sometimes essential, after playing vanilla and and with EL.
Jan Bartosik@witter.cz to 
Valheim is also capable of being extremely frustrating, so I'd recommend one of the mods that removes the skill penalty loss when dying. It might not be necessary, but dad knows the kids' temperaments better than me.
EpicLoot might also be good, if OP's kids are keen to grind components.
I'd recommend EpicLoot anyway. The effects it adds to some gear is sometimes essential, after playing vanilla and and with EL.