Crossword Genius

Lil ___ (two-palindrome family member) (3)

Ross

I believe the answer is:

sis

(Other definitions for sis that I've seen before include "Sibling (informal)" , "Secret Intelligence Service (abbreviation)" , "spies ..." , "Secret Intelligence Service (abbr.)" , "Relative's" .)

I've seen this clue in the USA Today.
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