I don't have any grandparents, but my Aunt and Uncle stepped up when they passed away saying they would "act" as my grandparents for grandparents day, etc. They have totally fulfilled their promise to me so they will be walking in place of my grandparents in my wedding.
So my question is: Do the grandparents dress to match the BP? Like would my uncle wear the same thing as the GM? Would my aunt by a dress like my mom and MIL?