My mother is to receive child support for her daughter. She was a high school senior and dropped out due to loss of family member. She has enrolled in corispondece classes via mail from a reputable university. My father feels he has no obligation to further pay child support, because my sister is not enrolled in the public high school. Although she is still a student, and taking classes, he insists that he has no reason to pay... is this true, and if so, should a personal lawyer be hired to go back to court?