I have a SD 7 and a bio daughter 8, they have a love/hate relationship. My partners ex is a piece of work and she manipulates, lies, and and calls the cops/children's aid for no reason other than maybe she's bored?

SD is learning these things from her mom who also bribes her with toys and adventures to come home early and prefer her house over ours. As a result my partner feels that the only way to keep her from having a tantrum or to win her favour he needs to give in.