How should we remember/honor my fiance's deceased father during our wedding?

My soon to be husband's father passed away almost four years ago. Sadly this was about two months before I met my fiance so I never had the pleasure of meeting him. We are now planning our wedding and I need some ideas on how to make him a part of the wedding, my fiance just keeps telling me to decide what to do because he doesn't care.I need some help.