I agree with the posters who say that Casey probably doesn't know or care who Caylee's bio father is. " Dead father" doesn't wash. This isn't World War II era America. Besides, even if he did die, he most likely had family who have grandparent's rights. There's the matter of the birth certificate and child support,too. IF she cared, she would have pursued the paternity angle legally, but apparently, she hasn't.
The more I try to put myself in Casey's place, in jail, alone, without her friends, her drugs, whatever, the more convinced I am that she did something much worse to Caylee than child neglect. Otherwise she would have the person holding Caylee produce her so Casey could get bonded out of jail ASAP.
This family may all ACT crazy at times because crazy may be their best defense if Caylee is dead and one of them was the killer. JMO.
Maria