Affecting more members of the same family than can be accounted for by chance, usually within a single sibship; commonly but incorrectly used to mean genetic. [L. familia, family]
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fa·mil·ial fə-'mil-yəl adj tending to occur in more members of a family than expected by chance alone <a \familial disorder> compare ACQUIRED (2), CONGENITAL (2), HEREDITARY
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adj.
describing a condition or character that is found in some families but not in others. It is often inherited.
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fa·mil·i·al (fə-milґe-əl) [L. familia family] occurring in or affecting more members of a family than would be expected by chance. The term is often incorrectly equated with genetic.Medical dictionary. 2011.