Joe had a crush on Sharon and relayed many of the similar experiences others described in their releationships with Sharon, especially her quick exit from phone calls whenever Floyd was around. But it was during those calls to Sharon's home that Joe said something interesting - he could hear a toddler in the background.
When Joe asked Sharon who it was she said it was her "little brother." According to Joe, the child was there in the house for some time, perhaps weeks, since he could hear him whenever he was on the phone with Sharon. I have no idea who the boy was or why he was in the home. It wasn't Michael, who was born two years later in 1988. Could the child have been another one of Floyd's victims and awaiting transfer or sale to someone else, much like Floyd sold Sharon's other children? I dont' know. It's just a guess.
Joe also mentioned that Sharon's son, Michael Anthony, was most likely named after Michael Anthony, the bassist in Sharon's favorite band, Van Halen.