HELP!! I have a really big family. My Grandma is no longer with us, but her sister (great aunt) is. I really want to invite her to the wedding and one of her adult children. She has 7 children whom are all adults and have many children themselves. I do not really know all of her children except for 1. Is it ok to just invite Great Aunt and one of her children? I literally would not recognize the rest of her children if I passed them on the street. TIA!