So, my fiance is from a very right wing old school fire and brimstone Catholic family. His sister is gay and dresses like a man. She is one of my bridesmades. Would it be terribly tacky if her tux matched the groomsmen? Plus, my father decided that this year, the year his only daughter is getting married to transform into a woman! S/he said that wearing a tux was fine, but s/he decided to get breast implants as well.
Personally, I don't care at all what my dad decides to wear or what my fiance's family thinks. But I do care about my dad and sister in law stealing the attention, at least during the ceremony.