Polychlorinated biphenyls (PCBs) were banned in the United Sates in the late 1970s but they are still found in indoor and outdoor environments. Even if your home was built after the seventies, it is possible that contaminants may be part of the indoor or outdoor environment. The source can be something as innocuous as caulking, floor finish or carpet dust.
PCBs are known under a variety of Trade Names.
There is no need to worry about whether or not your family is being exposed. We test for PCBs.