u/Otherwise-Kale-8938

My mom and her siblings, along with my dad and his siblings, lived around 20 minutes away in a very rural part of the Midwest. They all went to the same school but all moved away for college. My mom and dad both left to Houston, and started dating again, they dated a little in highschool so it was like a reuinion for them.(which is rare within itself). I dont know how they got together, but my dad's brother started dating my mom's sister. I've never met anyone else have this happen to their family. ​I think its called a siblings exchange? Please help me out!