consanguinity

consanguinity [ˌkɒnsæŋˈgwɪnɪti] n.

1.) The condition of being of the same blood; relationship by descent from a common ancestor; blood-relationship. (Opposed to affinity, i.e. relationship by marriage.)
2.) [Fig.] Oneness of nature; relationship, affinity (Oxford English Dictionary 2nd Ed.).

Etymology: From Latin consanguineus : con-, variation of com-, with + sanguineus, of blood.

"When I ask for a garment of a particular form, my tailoress tells me gravely, 'They do not make them so now,' not emphasizing the 'They' at all, as if she quoted an authority as impersonal as the Fates, and I find it difficult to get made what I want, simply because she cannot believe that I mean what I say, that I am so rash. When I hear this oracular sentence, I am for a moment absorbed in thought, emphasizing to myself each word separately that I may come at the meaning of it, that I may find out by what degree of consanguinity They are related to me, and what authority they may have in an affair which affects me so nearly; and, finally, I am inclined to answer her with equal mystery, and without any more emphasis of the 'they'—'It is true, they did not make them so recently, but they do now'" (Walden, Henry David Thoreau, 1854).