to a child who is in a family with a family income that is more than 500 percent of the poverty line, the fee under this subsection shall not exceed 7 percent of the family income. (3) Fee percentage applicable regardless of number of children served The total fee for a family that is subject to the fee under this subsection and has more than 1 child served through the program— (A) may increase as the family enters the second or a further child in the program