A Nice Message To Write In A Wedding Card What Should I Do About My Sister-in-law?

What should I do about my sister-in-law? - a nice message to write in a wedding card

Hello,
I feel this situation with my sister-in-law says.
I have 4 weeks until my wedding and her daughter, my little flower (not that they pay to buy something, we pay for everything and my colleagues from the mother for their flights and accommodation). Then she called me and told me that she and a brother of my friend have been broken, and it should not get in a position to the wedding.
Is now 2 days later they are together again, and it is not (to my e-mails or phone calls, I said nothing auget when she told me broke, I said, I argue that it has decided to do, too). I am totally fed up with this girl, because I am with my girlfriend, I have nothing but nice to her. During my pregnancy, sHe sent me horrible text messages, but if he apologized dissipate. Then in April he had his 2nd Child and sent him $ 500 worth of clothes for herself and her daughter to make him feel comfortable in clothes. You do not even have my son send a card on your 1st B'Day!
Then, 2 months ago, I signed for facebok and found it a picture of my son had written above and below, "It knows full Mant aborigional but with red hair. I was soo mad, and was in that I do that could see he was in last April, when he was sent to all donations. My son is not a native full, I am white, my father is white, married women and mothers father was white, not all of my brothers, mothers stated the red head, could I do not belIEVE was basically saying that my son is my son, friends!
I have never said anything, she soo is that I want to marry and to disrupt anything, but now it will not take my calls I am at the boiling point, what would you do to me?