I agree Arkadia, I felt the show explained exactly what problems the children faced- including financial details for all the families except maybe Jamarley's.
Only two families (Jamarley's and Liam's) had a parent who worked. Liam's mother was a shop worker at a discount school, and their father was absent. Jamarley's mother was a security guard and his father had been deported (the only bio father on the show who seemed involved with his child in any way). Both families received top-up benefits.
Shakira and Anne-Marie both had disabled younger siblings, and in both families the mothers were full time carers for this sibling, meaning the families relied on benefits. This also meant that their parents had less time to be involved in their lives, and although it wasn't shown, I think Shakira must have been involved in caring for her younger sibling, given the way she talked about him.
Kian's mother was disabled, and his father was her full time carer. His family relied on benefits.
Jada was essentially homeless due to a family breakdown, and at the start of the show shared a bed with her sister. I don't remember if they said whether her mother worked or not, but they were obviously in a very unstable home situation.
The show explicitly stated all children were on "free school meals", this means their maximum household income is