I wonder how long he’s known that he’s her brother? If it was something Jiren found out or if he had known from the beginning? Now the question is will he play the antagonist? Or does he have plans of his own to ruin the Zhangs from within because if he knows that Moyu is his sister than he has to have some idea the fate of his mother, unless he had been told some well-spun lies from the Zhangs. This is getting intriguing!
I don't know how should I react to this revelation but Yaaaaayyyy.. so happy to know Moyu's twin brother is still alive... He knows and loves her, I believe... I wish you can celebrate your next birthday together with Moyu, her family and friends, Jiren.. (feeling sad because he celebrate it alone).