I have been happily married for 5 years now. He has two children from a first marriage and I have one. For the first year I was the MOM to all three children. The biological mom was not in the picture and had not been for a few months. So I took over as MOM. 5 years later Mom is now considered the "FUN MOM" she gets the children everyother weekend. For about 2 years now the oldest continues to cause argument with me and drags my husband into it. So it ends up being a fight with him and I. We have had family discussion and talks. But it just doesn't work. She is rude to me, keeps and additude and basically does not respect me at all. Just last night I offered to take her to the dr but she said that she would rather her mom take her. I was so hurt I just walked away and went to my room. I understand I am not her mom but I feel like she could have said it in a better way but she was very rude about it and I am crushed. What should I do? I am afraid this will destroy my marriage.