Police stormed in after getting a call from the building in the Tremont neighborhood.
They rescued the 2-year-old boy, his mother and father, and arrested one suspect. But two gunmen still held the grandmother, with a gun to her head.
Police negotiators convinced them to drop their guns into a bucket lowered from the roof, and they were arrested.
The child's mother says she knows one of the suspects, who grew up with her in a project.
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