A contractor with family ties to the Chicago Housing Authority’s board tried to overbill the agency repeatedly, for a total of more than $175,000, according to a new report from the CHA’s inspector general.

After being confronted about her “exorbitant proposals,” the contractor turned hostile toward staff at the housing authority, threatening to complain to the CHA’s chief executive or the board, the I.G. said.

WBEZ has learned the vendor at the center of the I.G.’s investigation was Angela Parker — the sister of longtime CHA Commissioner Debra Parker.

The station reported last week that the CHA has paid a combined $22 million to Angela Parker’s cleaning and construction firm and two companies who also have close ties to Debra Parker. Those other companies who do business with the CHA a

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