AFFINITY: a kinship link created by marriage, such as the bond between a man and his wife and her family. People who have an affinity relationship with each other are "affines".
CONSANGUINITY: a socially recognized biological descent link, such as between a woman and her father, aunt, or daughter. Individuals who have a consanguinity relationship are "consanguines" to each other. "Consanguinity" literally means "with the blood", reflecting the old incorrect assumption that biological inheritance is passed on through blood rather than DNA. Consanguinity refers to the state of having descent from a common ancestor; being of "common blood" (siblings, cousins,etc).