Assalam waalakum...My brother, not by Islam or Brotherhood. My older sibling. Today, we were at school and we finish praying Friday prayer and the principal said "Stand up and pray your Sunnah." My brother was near me. I heard him saying he doesnt want to pray Sunnah and he began to pretend to be praying... I was actually shocked! My own big brother pretended to pray Sunnah. He did that because his friends were around him. I never seen him do it at home. I know Sunnah isnt mandatory but I am afraid he will do the same thing in Fard prayer! I have seen some kids talk during prayer and play around while we postrate. I am afraid he will do the same thing too. It hurts me. He is suppose to be a role-model to me...But he isnt.
I dont want him to go astray and being tortured. I want to help him but he doesnt like me telling him what to do and he always try to turn the conversation around or do a funny thing to mess the mood up. I need some advice, brothers. Please! For my sake, my brother's and Allah's, I need advice and support to prevent him going astray. Please. And thank you. May Allah help you and my brother. Inshallah we will return to Him!
Oh, he is buffer and stronger than me because he goes to the gym and he might literally kill me or hurt me. And I told my parents about it

Oh, he is buffer and stronger than me because he goes to the gym and he might literally kill me or hurt me. And I told my parents about it