Who was Sherlock's younger brother?

Question

Not in the original stories, but in the movie with Gene Wilder.

Answer 1

Mycroft Holmes was Sherlock Holme's brother.

Answer 2

In the Gene Wilder movie, Sigerson Holmes is Sherlock's brother (in the stories, Sherlock used Sigerson as an alias).
The "real" Sherlock had an older brother, Mycroft, who was extremely intelligent and who helped his bro solve a few cases.

Answer 3

Only name I ever heard his brother called was Mycroft.