There is quiet hope and caution in the hearts of Middletown area mothers and fathers whose sons are miles but perhaps only weeks away in North Korean prison camps. There are six known prisoners of war from this area. The parents know that only a few sick and wounded prisoners are certain to be exchanged, though the latest Red proposals hint a willingness to exchange all prisoners. The missing men from this area have not been reported either sick or wounded. Yet the parents wait patiently and hopefully. MRS. ALTHA Hamilton, 1303 Woodlawn Ave., mother of Pvt. Roland A. Hamilton, 25, listened to the morning news broadcast very carefully on Wednesday last week and then said, “But they’re only going to exchange 600 prisoners. That’s an awfully small number. You’d think there’d be many more. She spoke very quietly and did not look at her listener. “I’m hopeful for his return,” she said.