Aj, I see you placed this question under "Unconventional Marriages." Does that mean you signed up for an open marriage, as long as he doesn't cheat with relatives? Is that the red line, so to speak? If so, uh, Why? My understanding is that cheaters are not particularly good at keeping promises and I wouldn't be surprised if he slept with a cousin, niece, sister-in-law, or anyone else who is dumb enough to want him. No offense, but you might want to forget about the supposed cousin thing, and instead start figuring out why you are okay with marrying a cheater in the first place. Long story short, this may be a good time to raise your standards, girlfriend.