My FI has a good friend (Al) that has down syndrome and is an adult. He also has a younger brother (Timmy) that is a minor that my FI has never met before and probably won't be invited to the wedding. Am I correct in assuming that it would be fine to invite Al and Al's parents, who would have to come to help Al out for the day, but not Timmy? Would Al also still get his individual invitation even though his attendance is dependent on his parent(s) attendance?