Dh works Friday and Saturday nights, when his dd and ds stay I watch them on those nights. His ex has asked us to have them stay on a night that would usually not be our night so that she can go out for her birthday. I have already made plans to meet up with an old friend that night. Ds 15 months is staying with my parents that night. Ex won't let them stay on their own until I get home, probably about midnight at latest. Wibu to say no I am not cancelling plans I made months ago or is this what I signed up for?