"The Family of Blood" is the ninth episode of the third series of the British science fiction television series Doctor Who. Preceded by "Human Nature", 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 episode was first broadcast on BBC One on 2 June 2007.

It is 1913 in England, and war has come a year in advance as the terrifying Family hunts for the Doctor. When John Smith refuses to accept his destiny as a Time Lord, the women in his life—Martha Jones and Joan Redfern—have to help him decide.

In a Doctor Who Magazine interview, Executive Producer Russell T Davies characterised the "Human Nature"/"Family of Blood" two-parter as perhaps being too dark for the programme's audience. In 2008, both "Human Nature" and "The Family of Blood" were nominated for the Hugo Award for Best Dramatic Presentation, Short Form.

Following the events of "Human Nature", the Family of Blood hold Martha and Joan Redfern captive at the village dance and are forcing John Smith to choose which of them to sacrifice. While John struggles to understand what is happening, Timothy Latimer briefly opens the fob watch containing the Doctor's Time Lord essence. This momentarily distracts the Family, enabling Martha to grab a gun and escape with the others back to the school. John sounds the alarm and helps to organise the school's defenses while Martha and Joan search for the watch.

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