Son of Mine

Son/Brother of Mine was the leader of the Family of Blood.

Biography
Having assumed the body of Jeremy Baines from Farringham School for Boys, 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, 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. He was probably the most intelligent of his Family. (DW: Human Nature / The Family of Blood)

Trivia

 * After possessing Baines, Son of Mine appears unable to keep his eyes from being opened all the way most of the time.