Repeated problems with him expecting he can call/text DC the day before to arrange extra access.
I've asked him numerous times in the past that if he knows he has holiday/time off booked and will want to see DC to please just text and let me know in advance so I don't plan things which then get cancelled.
DD told me last week he has 3 weeks off work. No call or text for extra time with DC. DC call him today and say the ringtone is funny (ex obviously abroad, he hadn't told anyone but not my business). He later calls them and says oh yes I've been away but I'll come get you at 11am tomorrow. Not arranged between us at all.
I later text and say actually please don't just tell the DC you are having them you haven't checked with me. He replies I don't need to ask your permission, if you aren't busy (DC said we weren't) then stop being difficult.
This is by no means the first time tHis is has happened. Along with not bringing them back on time or texting 5 mins before drop off to say he is keeping them for another few hours.
AIBU to say no? You clearly knew you had holiday, why didn't you ask in advance! And by ask I don't mean telling the DC before asking me.