I feel like the answer is "nothing". My wife and I were talking about the parent's example of a 12 year old girl sitting in her dad's lap. I come from a warm, b

I feel like the answer is "nothing". My wife and I were talking about the parent's example of a 12 year old girl sitting in her dad's lap. I come from a warm, but relatively reserved, family and found it a bit weird. My wife comes from a very openly affectionate family and didn't. But from the reserved side of the exchange, I definitely tend hug my dad when I greet him or leave.