Do women have to file a claim for the CSA to go after a child's father Let's say the children are older and the woman hasn't made a claim Will the CSA go after the father automatically?

The CSA will only persue a NRP if the PWC makes an application for Child Maintenance. Under current legislation, if the PWC is in receipt of certain Social Security benefits, then the PWC is obligated to make an application to the CSA (refusal CAN result in loss of benefits).