Gama Droiville, 13, might have lost his vision following the Monday shooting, his dad said.
The gun that the boy used to shoot his sister was linked to the murder of Mohamed Hamwi.
A 17-year-old boy was killed in Brooklyn early Saturday, cops said.
Timothy Montalvo, 16, was taken into custody for his role in the killing of Raphael Ward, sources said.
Police are looking for Darnell Buffert, 21, in connection with a November 2012 shooting, the NYPD said.
Jorge Rosario, 17, died two days after being shot in the head in Bushwick.
Kaiim Viera, of St. Albans, was found with multiple gunshot wounds late Friday night.
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