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All answers having "Brother" as clue:

3 Character Answers:

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BUB

FRA

MAC

MAN

RAT

SIB



4 Character Answers:

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AMEN

MONK

RELS



5 Character Answers:

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ADIME

FRERE

FRIAR

OHBOY



6 Character Answers:

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FRATER

SPAREA



7 Character Answers:

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KINSMAN

SIBLING



15 Character Answers:

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