Ok. I'm 34, my gf is 28. We both have a child from previous relationships. My daughter is 8 and her son is 11. I have my daughter every other weekend and she has her son full time. We've been dating for about 5 yrs now and we recently got our first apt together in summer 2012....so the problem- my daughter is very immature n our kids typically don't get along. My daughter constantly whines and her son constantly bullys on her. I'm always mediating between them 2.....Although I do admit it has gotten slightly better over the past couple months. The kids still argue but not as much.