How do you address wedding invitations to a family with adult children?

Adult children are usually invited as individuals, not as part of a family group. If they live away from home, send them their own invitation to their own address. This is the clearest way to show they are invited and to allow them to RSVP for themselves. If they live at home, you can send one invitation to the parents, but list each adult child by name on the envelope. For example, Mr and Mrs Smith, and Miss Emily Smith. Or you can write 'Mr and Mrs Smith and family' but that can be vague, so it is better to name each person. If an adult child has a partner, include the partner's name on the same invitation, or send a separate one if they live together. Adult children may have their own dietary needs or guest preferences, so a separate invitation helps with that. If you are inviting some adult children but not others, be careful. Send separate invitations to those invited, and do not mention the others. This avoids awkwardness. The same rule applies to stepchildren. Treat them as individuals. If you are unsure whether an adult child is still living at home, ask the parents. It is better to send an extra invitation than to miss someone out.