Addressing invitations to families + 1?

This sounds really silly but I think you need to send three invitations to the same address. One for the parents, one for the son and guest and one for the other son.

As adults who live at home they should be treated as such.

Typically you would send an invitation to each adult in the home. The other option is to have The Doe Family on the outer envelope and then list each person by name, including the girlfriend, on the inner envelope.

All adults should receive their own invitations regardless of wether or not they live in the same household!

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I’ve spoken to both sons and they have no issue being included in the one invitation and I refuse to spend more money and waste even more resources to send three invitations to the same household – this is the one rule of etiquette I have no problem breaking, but thank you for your input.

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I think option A The Name Family and Ms Jane Doe would be the best in this situation.

I had a family that was 4 people, all different last names, and it was difficult to fit all 4 names on the invitation

If you are dead set on only sending one invitation for the household, I would just address it The Doe Family. Since you have already had a discussion with the son about invitations, he is obviously aware that you are stuck on how to address them, so I would just personally let him know that his girlfriend is of course invited as well. Then leave a spot for each person (including the GF) on the RSVP