My SIL has been dating a really lovely guy for about 6 months. He's great with our 10mo daughter and she loves him. Recently, SIL and MIL have referred to him as 'Uncle' a few times and I don't know if I'm comfortable with that. But I don't know at what stage a partner becomes an Aunty or Uncle as my BILs (my sisters husbands) were around for a long time before our daughter was born so they were obviously referred to as 'Uncle' straight away. To me, the titles of Aunty and Uncle are quite special, I know that a lot of people refer to their friends as Aunty and Uncle to their kids, but to me, they are reserved for family. What are your thoughts?