Quoting ♥K:" This whole thing makes me so upset. I didn't care at first. He lives in a hotel across country for work ... [snip!] ... her, but I figured cross country they wouldn't last because I know how both of them are, but now sshes moving out with him."
Wow that's almost enough to end the relationship with my sister. That is so wrong.
I don't blame you, I wouldn't want my LO seeing his dad & his aunt together either, that's just.. weird.
But as far as custody & courts go, there's no way you can say who he does & doesn't date, but I'm pretty sure you can make it so he can't LIVE with her & have LO there...