I know etiquette for American weddings says to send a separate invitation for every adult/family living in a house, but I'm not sure of the protocol for Indian families. Parts of FI's family have three generations in one house. Great-grandmother, uncle & aunt, and two cousins & their wives in New York, and grandmother, aunt, and one uncle & aunt & their two kids in New Jersey. Do we send a separate invitation for every family living in the same home or do we send one invitation per household?