1) i think i'll have to ask my sister about that... she's not married yet, but i expect it to eventually happen.
still, i don't think she'll want me to be anything other than present.
2) at my dad's 2nd wedding, i didn't do anything special, other than sing a song. was a little girl back then, and questioning gender wasn't yet a hobby i'd set my eyes on.
at my brother's wedding, i got no special role. all he wanted was for his whole family to be there. the night before the wedding, i wore male clothing (without binding anything). was well received by everyone other than my mother. on the night of the wedding, i wore female clothing, but wished i had more fitting male clothing to wear. i think some might have noticed i looked ridiculous, though most thought i was looking good. the bride was, and is, a very independent woman, and i don't believe she would ever try to deny any of the guests entrance based on gender or sexual identity. my bother, the groom, wouldn't have been allowed a negative opinion either.
3) most of the people i know are great people. my parents are the only bad ones, and my mother in particular.
i really should ask my sister about this. thank you for reminding me and giving me a good reason to come out to her properly.