I'm finding info online.
Jody and Carl were inseparable up until about the age of seven - the time that Jodi started getting hit by the wooden spoon. Carl was born in 1982. So she's two years old.
The babysitter Beth Hawkins on CNN
One incident in particular, I was called to babysit on a weekend night, I believe it was, and I was in the kitchen cooking them dinner, and they were in Jodi`s room, I believe, and they were just kind of interacting with each other. And all of a sudden, I just heard Carl just let out this bloodcurdling scream. I went in there and he had a pretty good knot on the top of his head. Jodi was standing there and Carl was crying, and he kept trying to tell me that she hit him. He was probably about three or four at the time.
So how old was Jodi when she had to pick up (IIRC Jodi said brother and sisters) the dirty diapers? Six or so? violence at such an early age isn't good.