Prohibition against filial disclosure

Dear PAO,

I recently referred a client to my lawyer-relative. After their engagement, I inquired about the nature or some details of the case of my friend, whom I referred to him. To my surprise, he did not even flinch in outrightly blocking me. According to my "not-so-close" lawyer relative, their communication is confidential. As such, he cannot share any information. May I know if a lawyer cannot really share any information such as the one described above to a relative like me?