J.L.
Hi, I understand your problem, I used to take care of foster kids that were teens. You can't say bad things about the birth mom and yet you'd kind of like to. I always told the kids that their mom did the best she could with what she had to work with. Then listen. At your house it's good to insist she goes by your rules. At her mom's house you dont' have any say. I also have step kids too and adopted kids (I have a lot of kids, and grandkids) Try to never yell. When you yell, you lose, period. Reasoning is often difficult but when you talk in a calming voice - firm but not yelling you will do better. Be a good listener. Good luck.