Obviously they're not actually in laws yet, but I'll call them BIL and SIL for the sake of this story.
Anyway, SIL is going to be my bridesmaid and she informs me that BIL was planning to propose to her at my wedding! She said she'd told him not to as it would be mean and I agreed and said if she steals my thunder I'll beat her with my bouquet! He's always doing things like this and he called another family member fat to her face and really upset her, she's only 17!
Grrrr.