Ike and Tina have 3 kids. Two of whom were left to Ike when his ex-girlfriend dumped on him and took off and one that he had with Tina. Their names are, Ike Jr (oldest), Michael (middle) and Craig (youngest). Ike Jr are Michael are Ikes kids from his previous girlfriend and Craig is the baby he had with Tina.

Okay well after Tina had the baby,"Craig", and they got married, they show a scene where the family and friends are having a get together as they pack and get ready to move to California, This is right before Ikes ex (Valerie) drops off the two boys and takes off. Well Tina is holding the BABY and her mother clearly says, "Let me hold that baby, give me Craig"...So Craig is clearly the youngest child.

Okay well later in the movie when Tina boards a bus with the three kids to leave Ike she has Craig, the smallest child in her arms . As she notices the older two children aren't on the bus she runs around looking for them with Craig in her arms. And then she sees Ike getting into a car with the two older children. She yells out, "Ike Jr & Craig!!!" well she's got the youngest boy in her arms, who is Craig! So the two boys she's yelling for should be Ike Jr and Michael. Clearly this scene suggests that Mrs. Turner doesn't know which kid is which..