Firstly I'm writing this on behalf of friend who doesn't have MN.
Her ex partner asked to have their son for a few hours to which she said yes. She didnt see or hear from son for three days. She was calling and texting him but he wouldn't answer the phone (6 times, split over the time he had him). When he did bring him back she told him she doesn't mind how much time he spends with their son but next time can he just call and let her know what the plan is. He said it's his son and he doesn't have to tell her anything.
Here's a bit of background: he only sees his son every 2-3 months, pays nothing towards the child and when he does call which is the day he wants him, he expects her to drop her plans otherwise there is an argument.
She asked me ISBU to want to know the plans so she is not stuck at home waiting because she doesn't know when he will be back. I said no, what do you all think?