It happened on West 40th Street and Eighth Avenue around noon, when police say 54-year-old Wayne Welds approached the family and swung the pipe.
The victim was struck in the head and suffered a laceration.
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Authorities say Welds then threatened the rest of the family with the pipe still in his hands.
He then fled the scene and was apprehended a short time later.
The victim was taken to Bellevue Hospital in stable condition.
Welds is charged with assault, criminal possession of a weapon, and menacing.
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