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All answers having "Relative by marriage" as clue:

5 Character Answers:

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GREEK

INLAW

LOOKS



6 Character Answers:

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AFFINE

BAFFLE

DEVOUR



7 Character Answers:

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STEPDAD

STEPSON



8 Character Answers:

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SONINLAW



10 Character Answers:

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STEPFATHER



11 Character Answers:

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MOTHERINLAW



12 Character Answers:

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BROTHERINLAW