Yeah, exactly...
And they broke up after Jesse was born.
It might be a little wierd to think that Jesse is Logan and Carmen's brother AND cousin...
But the same thing happens with my dad... my grandfather married two sisters and had children with them... Married first with one, had some children, and when she died, married with the other, my grandma, and had more kids, my father, among them.
Maureen didnt died, but it's the same situation with Robert, I guess. Happened to fall in love with both sisters!