No FOBD, that new info doesn't change my opinion. I still think that you should just stay out of it, let your Bro/SIL and Sis/BIL decide who they will or won't invite. And let your W decide whether or not she will show up if she is invited.
I want to add in response to someone else's post re this issue that I do NOT think that you should take a date if your W is going to be at either of these weddings. There is nothing wrong with dancing with the bridesmaids or whatever, but taking a date would just be a slap in the face and not in line with your goals of getting your W back.
BITS Denver
M 43 X 38 T 13 W moves out of home 11/2010 Roller coaster from hell 2/2011-5/2012 I request divorce 5/2012 W moves home 6/2012 Good time 7/2012 - 1/2015 I leave 3/2016 process of divorce