The Holmes Family

To those who know, there's only two Holmes siblings, Sherlock and Mycroft. Secretly, there was a third brother, Merlin Holmes, the youngest of the Holmes siblings. Hidden away from the world for his own protection, and trained to be a spy/agent for the British Government under the watchful eyes of Mycroft. Now his mission is to 'Babysit' Sherlock and John(in secret)Spy!MerlinHolmes