I looked up kid and got two different meanings.
- (of a goat) give birth
- deceive (someone) in a playful way; tease
Both are known to me in meanings such as "I'm kidding you" and "it's not my kid". However, I got curious as to the etymology of the two different meanings. If I'm to speculate, I can think of two ways to explain it.
First way would be some, to me unknown, common origin that gradually over time wandered off in to separate directions. The second way that those two have different origins and only happen to be spelled the same way.
So the question is which of the two above, if any, is the correct one in this case.