Son of Mine
Son/Brother of Mine was the leader of the Family of Blood.
Biography
Having possessed the body of Jeremy Baines from Farringham School for Boys on 10 November 1913, he led his family in a chase to catch the Tenth Doctor to gain his immortality. Otherwise, they would die in three months' time.
After the Family's defeat on 11 November 1913, the Doctor suspended Son of Mine in time and had him watch over the fields of England as a scarecrow.
Noticeably, he spoke in a way that made many of his consecutive sentences run together. After possessing Baines, Son of Mine appeared able to keep his eyes opened all the way most of the time. Perhaps as a side-effect from possessing Baines, the right side of Son of Mine's face was nearly always in a half-smile.
He was probably the most intelligent of his Family, which would explain why he took charge of the Family instead of Father of Mine, who would be the head of their family.(TV: Human Nature / The Family of Blood)
