(((((((((((((Anjelmarie))))))))))))))))) I'm glad it sounds as though you will have some peace this weekend when your BF takes his neice to visit his brother. I'm so sorry you are under this much stress and that it's so difficult to even find a moment alone with your BF to discuss things. Perhaps you can talk directly with his neice and give her some guidelines to follow while she is staying with you?
Wishing you all the very best