I know you're supposed to send an invitation to anyone over the age of 18. I am sending invitations to three families (that are my family), and they each have like 2 or 3 "kids" that are 18+, living at home (or are in college, but live at home during breaks). My motive isn't to save money by not sending out more invitations, it just seems really repetitive to have 3 or 4 different invitations sent to the same household. Thoughts?