بسم الله الرحمن الرحيم
Ask your son to do the following three acts regularly, in-shaAllah, all the effects of jinnat and jadu will end.
(1) Ask him to read Manzil daily after Fajr and Maghrib salah daily.
(2) Ask him to read Ayatul Kursi, Surah Ikhlas, Surah Falaq and Surah Nas 3-3 times each after Fajr and Maghrib salah and at the time of going to bed and blow on his hands and pass the hands over his body without a gap.
(3) All the three times i.e. at the time of breakfast and dinner and lunch time before eating he should read Surah Falaq and Surah Nas 7-7 times each with durood 11-11 times before and after and blow on the food and eat thereafter.
May Allah confer health upon your son and save him against all the magic and demon effects etc.
Allah knows Best!
Darul Uloom Deoband