Nazir Saunders, 20, and Anthony Alexander, 18, were convicted of murder after firing gunshots into a courtyard packed with people in 2017.
Police say at least nine shots were fired into the courtyard, where at least 20 people were attending a nighttime gathering.
Chynna Battle, 21, and Shaqwanda Staley, 29, were struck and killed by stray bullets while sitting with their children.
The children were not hurt in the shooting.
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