Mycroft Holmes

Mycroft Holmes was the brother of Sherlock Holmes and an ally of Bernice Summerfield. (BFBS: The Adventure of the Diogenes Damsel)

Biography
The Seventh Doctor, Ace and Benny met Mycroft while he was under the employ of the British government. (NA: All-Consuming Fire)

Mycroft once visited Sherlock to inform him that their father had died and reminded Sherlock that he had a duty to their sister. (FP: Erasing Sherlock)