At my wedding my SIL was a complete nightmare on the back of the registrar asking that any crying babies be discreetly taken outside during the ceremony. SIL took this that my mother didnt want her baby at the wedding??!!
So...she left the pram against the door I was meant to come through as the bride, when asked to move it she charged it into me and pushed it over my train etc. (I was obviusly unaware she was pissed off as i stood nervously on other side of door waiting to make my entrance)
Then she refused to come into the blessing later sobbing that she had missed that part!
Then when everyone was asked to take their seats for our entrance as husband and wife at the meal. She refused, stormed out yelling to DH that she was going for a piss instead!
Then during the meal, she took her 6 month old baby to her hotel room and left it in there alone when she came back to the meal. Then called my mum and I bitches when we told her we could hear the baby crying.
During the meal she stormed out crying in front of everyone shouting how her baby wasnt welcome. With all the family stood up shouting after her to come back.
Then at the evening do, she had full on screaming rows with all DH's family at how she wasnt welcome, how they should all go to bed. Family all told her she was an attention seeking drama queen and refused to talk to her.
So then she had a full on drunken row with her own DH who called her a shit mother! Then she tried to pour a drink over me, but i was holding her baby and she soaked the baby instead!
Two years later at another wedding, she launched into a row with us again about our wedding, and then with me 5 months pregnant said how me and the baby would die in childbirth! She's not a very welcome guest at celebrations anymore!