Police say the shooting happened at Stanton's home in the 4900 block of North Smedley Street around 10:30 Wednesday morning.
Police are not yet sure if the shooting was an accident.
The teens were in Stanton's basement when it happened.
One bullet hit a 17-year-old boy in the stomach. He is in fair condition.
Police found a bullet casing in the North Philadelphia home that is being analyzed, but officers have not recovered the weapon, and don't know its history or who owns it.
Kinta Stanton is charged with aggravated assault and illegal possession of a gun as a minor.
The shooting occurred while Stanton was on house arrest as a condition of bail.
He was released on $3500 bail in connection with murder charges in the March 2008 stomping death of Starbucks manager Sean Conroy on a subway platform near 12th & Market.
Stanton, who was 16 at the time, will be tried as a juvenile.
"That person's on trial. He should be on his best behavior, doing the best he can to straighten his life out, not bring harm to his family. This resurrects feelings for the Conroy family," said Sgt. Evers.
Kinta Stanton has been denied bail in connection with Wednesday's shooting.
He will be in court Monday for the start of the trial for last year's stomping death of Sean Conroy.
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