Boutonniers and Corsages Help

I am having a hard time deciding who to give boutonnieres and corsages to. I know traditionally they go to wedding party, parents, and grandparents. We are not having a wedding party except for a ring bearer and a flower girl. I was thinking just having my dad, fiance, and ring bearer have a boutonniere and not do corsages. I also thought of giving my fiance's grandmother who passed away an honorary corsage in her reserved seat and my grandfather who passed away last month an honorary boutonniere in his reserved seat. The reason we are having difficulty deciding is because I have both a stepmom and stepdad and my fiance has a stepdad. I would be fine giving my stepmom a corsage, but I'm not super close to my stepdad as I was an older teenager when he became my stepdad. I just don't want to leave anyone out or upset anyone. Any ideas or brides who had a similar experience?