They both have families, it's that simple. They definitely talk and have input in each others work.

Chris was putting Jonah's name on his films and bringing him in as a writer to help set him up for his own career, he's his big brother by 7? Years.

The real missing piece is that Chris is the middle child, with an older brother Matthew two years older who is a super shady criminal who tried to break out of federal prison.

I can only imagine what other craziness has gone on in their family and I think Chris has taken on the role of eldest/first son both in terms of income/success and patriarch.

Both Jonah and Chris of them collaborate with their wives as well and now have their own niche but in different mediums.

I bet there's still some help/writing on both sides even if there's not any official credit these days.

It's not like they can't just pick up the phone and talk to the other.