hi kat i know how you feel, i have two boys with my partner and he has a son from a previous relationship. his son is 6. we have been together for nearly 5 years. his son stays with us evert other weekend and to be honest at time it is so hard, i get
" your not my mom"
"you cant tell me what to do"
" im telling my mom"
it is very hard, my two boys are quite calm children untill there step brother comes then they are hyper. his son is a very hyper child, and gets what he wants at home, because his son is always hyper and my boys are not, my partner see's it as our sons are being naughty when there hyper but they are just simply copying there brother. my sons are always being told off by there dad when his son does what he wants.
12 months ago me and my partner had a big talk and i said i had enough of his son doing what he wants, not listening and generally being cheeky, i didnt want it anymore. my partner told me how, because he didnt see alot of him he hated telling him off, because he wanted his son to like coming to see him, i explained that just because you set ground rules does not make you a bad parent. i told him things had got to change as i wasnt happy.
he took what i said on board and 12 months later we are so much happier, there are still things that need sorting but has been a big improvement.
it can be so hard if you dont have that bond with step children, but my advice is to talk to your partner, tell him you are not happy and that you cant live like it anymore, he will either chose to change things or walk away, if he walks then this relationship was never going to be long term, as his daughter would always come first and win!!
In tim eit will only start to effect your children too, as they will not see y she can do as she wants and they cant
good luck x