They aren't all widely variant and unrelated though...

[img]http://upload.wikimedia.org/wikipedia/commons/1/12/South_Asian_Language_Families.jpg[/img]

There are similar cultural threads, and referencing each others posts while also borrowing cultural elements will help to make our world seem somewhat similar too. I'm not saying everyone be the same in everything. I'm just saying we should all make sure to show that all of our stuff is happening in the same world.