A Black family is suing two real estate brokerages and a real estate agent after the agent refused to sell a unit to them in a new Katy condominium building, according to a federal lawsuit filed Friday in Houston. In a recording, an agent can be heard saying she cannot sell to the three real estate investors — a husband, wife and the wife’s sister — because “we won’t be able to get along with each other well.” The family had offered to pay the asking price in cash. The lawsuit also includes a flyer advertising the building as an “option for Chinese and Asian communities in Houston” where people…