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Consanguineous - Definition - of the same blood or origin; specifically : descended from the same ancestor
Consanguineous is sometimes used to describe marriages or intimate relationships, such as
when geneticists discuss birth defects in the offspring of consanguineous unions (i.e., unions
between close relatives). Nowadays, we understand that ancestral contributions are not
transmitted through blood but through genes contained in chromosomes.
The middle portion of consanguineous comes from the Latin sanguin-, meaning “blood.”
This root is also found in sanguine, a word which, confusingly enough, may be defined as
“marked by eager hopefulness : confidently optimistic.” The reason for this is that an early
meaning of sanguine was “having blood as the predominating bodily humor,” with humor
here referring to “one of the four fluids entering into the constitution of the body and
determining by their relative proportions a person's health and temperament.” If you prefer
to use words in a logical etymological fashion (which is never a good idea) you may restrict
your use of the word sanguine to its sense meaning “bloodthirsty” or “bloody.”