Dp and me are getting married in August, mil is kicking off because dp has asked a lifelong friend who we see frequently to be his best man. She thinks dp should choose his brother who we see infrequently at family events. She is threatening not to come to the wedding if dp doesn't choose his brother and says that she is "disgusted" at dp but that she "doesn't blame" me
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I am really annoyed with mil who I think should keep her nose out of it all and who imo is clearly showing her favoritism to dp's brother.
I am expecting her to ring me today and will struggle to keep my cool.
What should I say?