I hv contact his sister at least twice and what i know is his sister did inform her twice, they r not staying at the same place so it would be hard for her plus ayil had asker her to stay away from this matter as he said he will solve it himself. his sister ask me to not involving her anymore regarding this matter as she herself dont really care about his brother wrongdoing.

I feel like yes we hv to respect her decision but nevertheless, i will ask her again on how u guys can find him.