Niles Crane

Dr. Niles Winslow Crane (b. June 10, 1957) is a fictional character on the American sitcom Frasier, a spin-off of the popular show Cheers. He is played by David Hyde Pierce. Niles is the younger brother of Frasier Crane and the son of Martin Crane.While it had originally been intended that Frasier be an only child, David Hyde Pierce was hired because Frasier producers saw his headshot and commented on how much he looked like a young Kelsey Grammer. Unlike Frasier, much of whose background comes from the Cheers series, Niles' background is established over the course of Frasier (with additional retcons made where necessary if Niles' existence clashes with previous revelations made on Cheers).
See more at Wikipedia.org...