PHOTOS: Firefighter responds to collision, discovers victims are wife, son

Aaron Van Riper found his son Jonathan at the scene of a head-on collision. (KTRK Photo/ Family photo)

Aaron Van Riper's wife Amber and son Jonathan. (KTRK Photo/ Family photo)

Aaron Van Riper (KTRK Photo/ Family photo)

When Aaron Van Riper heard a call for a head-on collision, he had no idea he would soon find be among those trying to save the lives of his family (KTRK Photo/ Family photo)

HOUSTON (KTRK) -- When a Thomas Lake firefighter heard a call Saturday for a head-on collision, he had no idea he would soon find be among those trying to save the lives of his wife and young son.