My boss a single dad with full custody of his teen DD. they are very close, do everything together, she often accompanies him to work sponsored events and formal sorts of things. He is in a LTR with a woman. They don't live together but have dated for a couple years. There are photos of them together (on his desk, FB page), but none of them seem to involve his DD. i don't know if he compartmentalizes his love life from his parenting or if the DD/GF don't like each other....? Either way, I've only met his DD and not his GF. Address to him & guest (the intent would be neutrality but i worry it would come across as dismissive of his relationship or closeness with DD). Him & DD? GF? All 3?