"A working relationship" I like that, I will henceforth use it to describe my relationship with husbands brothers wife.
I have a working relationship with my spoon, er sorry, I meant my BIL's wife.
hahaha. What I meant is that we have a relationship that works for both of us. No conflicts and no expectations either. We respect each other and meet on friendly terms but we don't really share any personal situations or challenges, or the closeness that I'm sure many others in this relationship share.