I have a 13 ur old SD who when she wasn't seeing her biological mum was very attached to me and I had a good relationship with, she's always been somewhat a handful but nothing that I felt was detrimental to myself or this family. After the birth of our own daughter who is now nearly one, my SD became very jealous, she is very attention seeking and although has love for her half sister, she plays up all the time when she's not getting what she wants. (I do my best to show equal love where possible, and spend quality time with both children, as want them to both feel loved and cared for.)
Recently my SD started seeing her biological mum who is now expecting also, and prior she hated her massively, and now suddenly their relationship is all sunshine and roses and although I'm happy for her that she has that back, she's been a nightmare at home treating me like a piece of dirt on her shoe, swearing, slamming doors, won't go to her room, won't listen, won't respect any rules or anything I say.
Her dad is emotionally entangled with her and hates to lay down the law and sometimes he backs me up but sometimes he supports her which sends her mixed messages. I've done everything I can to explain how I feel and my partner just doesn't see how badly I'm hurting from the constant abuse from his daughter towards me. I love my partner and worry our daughter whose one will start to copy what she's seeing and if that was the case I'd leave.
I want my step daughter to have a good relationship with both her families, all I've done is care and be there for her and she's so nasty and rude it's making every day a living hell. Any other step mums with similar experiences I'd love to know how you all coped and made it through as a family: doing my best to not run for the hills as love my partner and don't want my little girl to loose out on her family with her dad and sister but this is getting unbearable