Dp, me and my 12 yr old son live together. I am still finding that days out with my son are only happening with my friends. If we have dp 3 kids at home dp wants us all to go out. I give his kids a lot of time and its hard work. I don't mind but i'm getting resentful that he doesn't want to give my son time. If its just me and DS, he find an excuse not to come with us.
However I also find myself not really wanting him to come anyway as I feel pulled between the two. We don't seem to blend as a threesome at all. I feel like a single parent still but with the added pressure of dp to keep happy and also his kids when they are with us not to mention the extra housework etc.