I've NC for this.
Split from my exH 2.5 years ago. We have 2 kids - DS1 is 10 with ASD, DS2 is 7. We currently have a pretty much 50:50 split of time with the children. ExH stayed in our marital home.
Weekends are alternated. This weekend should be my weekend. DS2 asked to call his Dad tonight, which is fine with me and he often asks for this, so we did that. He gets on the phone, and says "Dad, can I stay at your house this weekend?". ExH replies with "Of course, I'm working part of it, but can see you on Sunday. Talk to mum and let me know what the plan is".
WWYD?
I don't want to influence any views by adding mine at this point, I'd just be really interested to hear what other people would do in this situation.
TIA!