…interest in Richard’s favour, generally; and Sir Leicester had replied in a gracious manner that he would be happy to advance the prospects of the young gentleman if it should ever prove to be within his power, which was not at all probable, and that my Lady sent her compliments to the young gentleman (to whom she perfectly remembered that she was allied by remote consanguinity) and trusted that he would ever do his duty in any honourable profession to which he might devote himself.
There are no more uses of "consanguineous" in the book.
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They considered consanguineous marriages up to the third cousin as incest.
The risk of birth defect increases in consanguineous marriages.