I am 44 and she is 42. We have 4 children they are 22,19,16 and 6.
Hi brother,
The most important thing right now is the 6yo. The second most important thing is your relationship with the other three.
As others have suggested, get some type of parenting agreement on who's time it is to watch 6yo. 50/50 is best unless one of the parents is extremely f'd up. Keep track of any exceptions. Exceptions will occur and you should be flexible and available. If it becomes excessive, then you may need to address it.
Emails/text about parenting and other business is fine. No personal issues.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712