5urprise's Gong Myung mentioned his brother, NCT U's Doyoung, while he appeared on SBS powerFM's 'Choi Hwa Jung's Power Time' on July 29.  

Gong Myung said, "NCT U's member Doyoung is my younger brother," then played the requested song, NCT U's "Without You" after which he said, "My brother really liked this song.  Doyoung, we both live in Gangnam but we haven't been able to see each other lately.  I miss you."

Aw... how cute.  Hopefully, they can have a brother date soon!