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Ancestors who are incest.

When someone's bloodline is all incest and relatives only reproduce with other relatives they may be refered to as incestors.
Queen Victoria is not very fond of her incestors or her son and daughter's incestry
by Matt Huff October 27, 2009
One who willingly participates in incest. One who is incestous
Typo on Jay Leno:

Come look at this house! Incestors (sic) welcome

Should have said investors, eh?
by Kung-Fu Jesus April 17, 2004