Where both parents have the Farris gene. Example: If two people of the Farris line marry and produce a child, that child would be a DOUBLE FARRIS.
The birth of a double-farris child is often met with offers of condolences not congratulations.
Such double-farris individuals have an exceptionally low survival rate in a low-technology climate. They tend to be exceptionally sensitive and sometimes with unstable personalities. Once this phenomenon is better understood and remedies have been developed to sustain them, the double-farris individuals can find their unique places and be extraordinarily productive. They do tend to be Endowed, which only makes life harder for them. Nobody envies a double-farris. Such children often complain to their parents, "Why did you have me?" And very often they grow up determined not to have children of their own.