the car crashed when a left rear tire tread separated on the florida turnpike on saturday .
the crash took place at about 4:45 p.m .
uriel miranda , 38 , who was in the car with his wife and seven children as well as his three brothers , died at the scene .
his daughter , yaretsi miranda , 2 , died along with yordi miranda , 8 .
troopers say all 12 occupants were relatives from apopka .
police report indicated half of them were n't wearing seat belts .