When doubled, popular 1990s sitcom featuring Tia and Tamera Mowry

I believe the answer is:

sister

(Other definitions for sister that I've seen before include "Nurse, nun or relation" , "of the same origin" , "A kinswoman" , "Resist (anag) - nurse" , "Relative in hospital?" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.