Jack Quire (born May 29, 1994) aged 23, is Stephen's Brother who irritates him, and he is also the filmer of the Freakout kid. He laughs when he gets mad or when his dad beats him.
In some of the AGK Series where Leopold battles or annoys Stephen, Jack is shown and humiliates him and while Stephen is fighting Leopold he tells Jack to shut up.
"Stephen you suck" - Jack
"Shut Up!" - Stephen