My aunt recently separated from my uncle and has moved to Colorado (from Michigan). He lives in the house they owned together and she is renting a house so they are definitely separated, but they are holding off on actually divorcing as he is unemployed and they want to wait until he finds work so he doesn't have to worry about medical coverage.
I figured we would just send the invite to her, but then my mom wondered if she would be offended if we didn't extend the invite to him as well since they are legally still married.
Another aunt is going to talk to her to see what she things, as we don't want to offend her one way or the other. But I wanted to see what the proper etiquette would be for the invite.