Pianist and singer Isaac Waddington (15) caused his younger brother to cry with pride during his performance on Britain's Got Talent.
Blonde Jack wasn't the only one in tears, however, as Isaac's parents and half the audience were blubbing too.
The brothers are very close, with Jack saying of his big bro, "I really, really love him and he's really kind to me… Sometimes!"
"I would love to be as talented as my brother is. I look up to him. He's amazing."
Following Isaac's performance of Billy Joel's She's Always a Woman to Me, judge Alesha Dixon rose to her feet and said, "I got completely lost in that song with you."
Simon Cowell added, "I think we've found somebody really truly special."