Kay's baby daddy was her cousin, Bjorn...

Yea, he did confirm Bjorn was the father on Reddit. Here's a link to the comment: Yes he is. Good catch!

Side note, they're ALL cousins lol, even Bjorn's new lady, Navarro. Rain is the only one that's not related, so far as I know.

So what you are saying that they are space hillbillies... ;P

As one reddit user posted:

"In space no one can hear the banjos"