Whole bunch of nothing. He merely cried because he was not let in on the family finally acknowledging KC was indeed pregnant. (He already noticed, mentioned to the Queen, she shot him him down.) He cried b.c he did not go to the hospital when Caylee was born due to family conflict, he regretted. He cried b.c the stress of all of this is too much. He, at first, said he knew nothing of the family finally accepting KC was prego, but on cross he admitted he knew the family was creating a nursery in the house that he still lived in.
In other words, his testimony with JB said he did not know anything about the family accepting KC being prego, JA got him to admit he did. Therefore, his testimony was impeached.
Many years of pent up tears came out and made it seem scripted like a Soap Opera.