Realising that he is their equal parent and as such I don’t have either more rights or more responsibility over the kids.
Both being flexible around schedules
Ensuring and even enforcing schedules (ie not pandering to it when a child tried to play one off against the other)
having similar rules/standards in both Households.
Communicating well about the kids (both practical things and also more emotional stuff they might have said/be going through and nice things -more when they were little-pics of them on a day out of whatever).
Prioritising the other parent over new partners for things like attendance at school events where tickets are limited.
making it clear to new partners that the other parent will always be consulted and listened to about parenting decisions before the new partner is. New partner can also of course have input and they do have great relationships with the kids-but they have never been set up to be their ‘new parent’-they already have two of those.
Christmas and birthday gifts are funded between us both and come from us both. Avoids them getting spoilt and again playing off each house against the other. When they were little we spent Christmas Day and birthdays together in one house or the other which was great for them, if hard for us.
We have had alot of flash points over the years, don’t get me wrong. Exh had an affair with my then best friend. The fallout was seismic in all areas for me. But we still never put the kids in the middle or used them as weapons and it’s served us and them well.