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All answers having "Fathers" as clue:

3 Character Answers:

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HES

PAS

SES



4 Character Answers:

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DADS



5 Character Answers:

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ABBAS

DADAS

PADRI

PAPAS

SIRES



6 Character Answers:

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BEGETS

OLDMEN

PADRES

PATERS

POPPAS



7 Character Answers:

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CLERICS

DESIRES

PRIESTS