"The Family of Blood" is the ninth episode of the third series of the British science fiction television series Doctor Who, which was first broadcast on BBC One on 2 June 2007. It is the second episode of a two-part story written by Paul Cornell adapted from his Doctor Who novel Human Nature (1995), co-plotted with Kate Orman. The first part, "Human Nature", aired one week prior, on 26 May.

The third series of the revived British science fiction programme Doctor Who, and the twenty-ninth season of the show overall, was preceded by the 2006 Christmas special "The Runaway Bride". Following the special, a regular series of thirteen episodes was broadcast, starting with "Smith and Jones" on 31 March 2007 and ending with "Last of the Time Lords" on 30 June 2007. In addition, a 13-part animated serial was produced and broadcast as part of Totally Doctor Who.