bestfriend vs family

I would depend on who she is closer with. Some people are much closer to their friends than their family. Are the weddings at the same time? If not, maybe she can do both. That is a hard decision and it is going to create some hard feelings. I would say that the bride who is marring the brother might want to have one of her friends as the bridesmaid, unless this girl is very close to her sister in law to be. She could do one wedding and the others reception?

I would simply say yes for the one who asked me first.

i wouldnt know what to do neitehr buddy, that is tough place to be, you dont want to get both side upset, one is your family and the other is your best friend, one of them will feel hurt when you dont show up.

I agree with you. It's never a good ideal to compare your best friend with family. Trust me, I know from experience, and I learned it the hard way. If my partner wants to remain close to family members without feeling any sort of weirdness, or resentment, because of a previous experience than it's okay I would prefer family over friends.

This isn't this uncommon. We had friends announce their engagement after ours by a few weeks--and then they announced their wedding date to be in October of the next year--we have a lot of close mutual friends. So we planned ours for June, well not just based on their Oct decision but also because it was a nice month for weddings :). So we had some of the same ppl going to each wedding--but then really last minute (2-3 months later) they decided that they would get married 6 wks before us--vs the orginal 90 days later. So we had a lot of friends who suddenly had to chose which wedding to attend due to budgets and stuff. we found that it worked out rather correctly, the ppl who she was closer with picked hers--and the ones we were closer with picked ours. So your friend will have to do the same unfortunetly.