Diff'rent Strokes (1978)
The series stars Gary Coleman and Todd Bridges as Arnold and Willis Jackson, two African American boys from Harlem who are taken in by a rich white Park Avenue businessman named Phillip Drummond and his daughter Kimberly, for whom their deceased mother previously worked. During the first season and first half of the second season, Charlotte Rae also starred as the Drummonds' housekeeper, Mrs. Garrett.
Diff'rent Strokes - watch online: streaming, buy or rent
Currently you are able to watch "Diff'rent Strokes" streaming on Starz, Starz Play Amazon Channel.