I can't tolerate being with my mom and her husband (hate the word "stepfather" as I don't feel that man anything close to me) more than 2 days. After that it gets too intimidating. I can feel that he can't stand me and even less my kids as well. Last year we spent a week together and it ended with serious insults. Now I learned to limit the time together to keep my sanity. Maybe that works for you as well.