Relation by marriage (6-2-3)

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6-2-3

7-2-3 8-2-3

sister-in-law

'relation by marriage' is the definition.
(I've seen this before)

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(Other definitions for sister-in-law that I've seen before include "Person related to one's spouse" , "Relation by marriage" , "Relative by marriage" .)

I've seen this clue in The Guardian, The Times, The Sun, The Independent and The Telegraph.

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