My DP and I have a child each from previous relationships. We also have our own joint baby. My DS’s father has him EOW and we have flexibility in that he can see him whenever he wants as well (they have a great relationship and have a joint hobby). On occasions my DS will ask to go see his dad on the weekend that is meant to be mine. I don’t have a problem with it however my DP does. I suspect it’s either because of his DD who would like to play with my DS or that his ex partner keeps a very strict routine which he adheres to and never gives him flexibility which I know he’s bitter about. How to I balance this situation? I can’t say to my son he can’t see his father because my DP DD is coming over and she needs him to play with her. Help!