Colin Firth and His Brother Jonathan
There is no doubt that Colin Firth is a very talented actor. He has been praised as one of the best English actors of his generation and has appeared in many great films. However, he did start out his career doing theatre productions and only later moved into film work.
The actor has two siblings, a sister named Kate who is a voice coach and a brother named Jonathan, who is also an actor. Unlike Jonathan, however, the older sibling branched out to Hollywood, which might explain why he is more famous.