Hmmmm......?

this is a controversial question a lot of christians ask this. we talked about it in my school (christian school) in the beginning of this year...i dont really remember why cuz this confuses me a lot but something about we're all descendants of them and now the world is so big and really now we're all cousins...really really distant cousins lol but if we have with like our brothers and sisters the kids will be in breeds thats our family now. after the tower of babel God spread out everyone thats how we got all our languages and cultures now and theyre all their own nations now. confusing i know but i still dont really get it thats the best i can explain