Ok I'm new and I'm pretty sure this board is for those that are getting married a second time but I need advice from experienced brides please!
I am marrying a single dad. We have been together since she was 2 1/2 and she is now 5. I've been around more than mom was/has been(one weekend a month and whenever else she had time). I now live at the house with FI and his daughter(long story). Mom is now back in the picture(every other weekend and Thursday nights) and filling daughter's head with lies about me; I'm a horrible person, I lie, I'm stealing daddy, we are going to have another baby and get rid fo her. I couldn't imagine not having that little girl in my life!!! She is also starting to act out more at school. My FI and I share dispiline roles(his idea and I have limited say) but now we are at a loss of what to do. She didn't start acting out until she started spending more time with mom and her older children(20 and 16 who hate my FI). Is there any advice y'all have for either one of us in this difficult situation? My FI is scared if we do discipline her for acting out she will want to go to mommy's more and he will lose the battle. Thanks ladies!