How can we help my cousin brother’s recent behavior with tawiz?

My mama and mami are very annoyed and disturbed by the recent behavior of my cousin brother. Till sometime back he was going around with a non-Muslim girl from his school. But Alhamdulillah we managed him away from this grave sin. Alhamdulillah he even did taubah and vowed never to do so again. But off-late he has become very short tempered and ill-mannered. Always arguing with mama and mami and even replying in curses. When his anger ceases off he is very apologetic about his behavior and starts to cry. My mama and mami are very worried about his unusual behavior and fear for his health and well-being. Please suggest some tawiz that we can tie on his neck or arm. Alhamdulillah my mama, mami and my cousin brother are stead fast in sawm and salah.