Ewan McCrimmon

 was the cousin of Donald McCrimmon. He lived in Scotland during the 13th century. Jamie McCrimmon met Ewan during his travels with the Second Doctor and Victoria Waterfield. Since it could change history Jamie couldn't tell Ewan that he was the son of another Donald McCrimmon. However he told Ewan his name and said that he was a member of the McCrimmon family. Ewan thought Jamie might have been a bastard because he wouldn't tell who his father was. He also mentioned that Jamie looked similar to his cousin Donald. (PROSE: On a Pedestal)