Name this mob/western movie?

its a black & white movie and it features a family that are like mob/gang type family , features only the mother and sons i think and they capture i think the sherrifs daughter and they keep her locked in a bedroom , the mob familys son has a disability starts to like the girl nd tends to look after her and doesnt... show more its a black & white movie and it features a family that are like mob/gang type family , features only the mother and sons i think and they capture i think the sherrifs daughter and they keep her locked in a bedroom , the mob familys son has a disability starts to like the girl nd tends to look after her and doesnt like to hurt her - basicaly falls in love with her

any help on this please
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