The animation here is pretty interesting.
It's very loose and cartoony. It fits the characters' personalities.
Strike that -the animation develops the characters' personalities.
In the first shot, we have a funny, simple "take" by the father.
Only four drawings required.
1. is the starting position
2. is an inbetween of 1 and 3
3. is the downward extreme
4. is an extreme the other way. NO INBETWEEN
The pop between 3. and 4. is what makes it work.
There's no "settle" back to 1. here (which is often required in a "take") because Crazy fills frame.
We then cut 180 degrees to the Father's point of view. Crazy's animation is, well, appropriate.
It's a 3 second shot, entirely on 2's (meaning 36 drawings). Here are some of the key poses he goes through.