A new article. From this - it seems it might be one of the children in the truck.
QUOTE:
The four children range in age from 7 through 11. Riordan said one child, Victor Vocter, remains in the hospital and the remaining children are with grandparents under DCF protective supervision.
He did not give an exact number of children with the grandparents. However, CBS4s Gary Nelson has confirmed that only two of the children are with their mother at their grandparents Southwest Miami-Dade home.
http://miami.cbslocal.com/2011/02/15/barahona-neighbors-started-after-body-found-in-truck/
Also it says the children are staying with their mother - I'm a little unclear about this. Is it their "adoptive" mother and wife of the driver? Or is it the "bio" mother that this couple adopted the children from?
Also, it seems they still haven't removed the body.