Penji, try to put Paaht/Katha/Vichaar on, whether it's cassette, radio, tv, vcd,dvd. Remind him of the Qurbaniyah out Guru's had made, The Qurbaniyah of the Mahaan Shaheeds. Remind him of our Chohte Sahibzade who were only in their childhood and gave their Qurbaniyah for Sikhi. See if that makes n e difference on him. I'm sure Vaheguru Ji would show him the path of Sikhi one day or another.