My fiance and I will be having a semi-formal wedding in a friend's garden. My fiance's parents are elderly and his father will most likely be in a wheelchair because he has difficulty walking on uneven ground. Our original plan was to have my Grandma seated and then my fiance seat his parents (his grandparents are deceased); both my parents will be walking me down the aisle. My concern is that it would be too much for his parents to do the traditional seating of parents.
Would it be appropriate to have my Grandma and my fiance's parents seated prior to the ceremony beginning? Do I put something in the program that they are already seated?