[He winces a little, already feeling pretty bad about just dropping that on Finn.]

No, that's okay...I'm sorry I brought it up...

[It was a little unavoidable, but that's not much of an excuse.]

Well uh...probably from another human...most likely anyway. From your biological mom...

[He blinks, and then fumbles a bit to correct his choice of words.]

That's just the person who gave birth to you is all though. Your real mom, that's yours and Jake's mom, is the one who raised ya.