I don't know if this has already been asked before, but I need help. We are planning on inviting our friend David and his minor son. David recently began dating a new man and they don't live together. I want to invite all three of them by name. I haven't met the new guy (they live out of state) so it would feel weird to send him his own invite. How do I address the invitation to make it clear it's for all three of them with using an inner envelope? Thanks!