When i was a baby i was put up for adoption, recently i found my birth mum and we really got on. Last weekend was our first year anniversary so we arranged to have a party at her sisters pub, My future sister in law keeps nagging to meet my birth mum so i invited her and her parents. Big mistake! It was her birthday the day after! We all said we was not going to go over the top with drinking so we had lemonaide with our wine but my sister in law had 3 glasses of wine and as soon as it turned midnight she ran round telling everyone it was HER birthday! But soon after then her parents left cause they stopped in a local hotel but she stopped over at our house for the night. I was a bit upset that she tryed to take over our party but i carried on having fun. Then it got worse, My birth mums sister lost a baby a few years ago and they played a song that reminded her of her baby so we got up as a family and had a cuddle on the dance floor. So my sister in law comes in and we explain to her why we are doing it and because she was not getting all the attention she ran off crying! After that we set off a chinease lanton for her baby and she was crying cause it wasnt her that got all the attention again. In the end we felt bad so we got her a special drink and she rubbed it in my face! She was rude to everyone on the night, Even at one point going to the bar and telling them that she is allowed a family discount! Yes i tryed to enjoy myself but im so upset cause she has had 22 birthdays and my first year with my birth mum and she messes it up and im never going to get that night back. Then the next night my fiance spoke to her on the phone and she got her mates to text him to say he is a bully and we ruined HER birthday party. She is just rude because she did not even know anyone at the party apart from her parents. She sent me a text to appologise after people told her she needs to but she still blames the drink. I really dont know if i can forgive her but i dont want to upset her parents who are also very ashamed of her. Please can you give me a bit of advice? sorry about going on and on