From what I have read here and in MSM, it doesn't sound like they have any income other than aid for dependent children (or whatever it is called in Illinois), etc. Possibly the boyfriend/dad may have gotten retirement from the Armed Services, but I doubt he was old enuff to have been retired 20 yrs or whatever. Maybe he was receiving disability of some kind.
They did have debts, I would assume: trailer and lot rent, electricity, gas/propane, clothing/shoes, some groceries not covered by WIC or food stamps (assuming they had those benefits), drug prescriptions, & whatever else.