Interesting! I would say yep you are their Aunty. I have always thought of dh and I as aunty and uncle on both sides but I thought I'd ask him. I said do you think of yourself A,A and J's uncle? (Terrible aunty I am I left out 2 others we never see!) He said he doesn't really think like that. He said he only met his real aunts and uncles a few times so doesn't think much about titles at all.