Question about social security survivor benefits?

Our step son just turned 18 years old last month but he is still in school. He was collecting survivor benefits from the death of his father last year. He is still in school right now. We are doing home schooling but he also goes to the school to get his lessons and does his work from home and the teacher from the school grades his work. On the form it asks if the child is in school full time, what do I put? He goes to school and gets his lessons and does his work from home. He is set to graduate in December 2011.