A consanguineous marriage is one where both people share a 'blood' relative. As far as it being a good thing, would depend mostly on what continent your on.

kon-sang-GWIN-e-us

It means "related by blood," or relatives of some sort. Hope this helps~

George Byron Louis Arner has written:

'Consanguineous marriages in the American population' -- subject(s): Accessible book, Vital Statistics, Consanguinity

consanguinity has never seemed to be one of your prerequisites for telling the truth