Families paying off rent, food, debts with child tax credit

In this Wednesday photo, Christina Darling plays with her sons Kayden, 10, left, and Brennan, 4, at home in Nashua, N.H. (AP Photo/Elise Amendola)

NASHUA, N.H. — Christina Darling finally replaced her 2006 Chevrolet Equinox after it broke down several times while picking her children up from day care. But the 31-year-old mother of two was struggling to keep up with the car payments.