Horror story with family curse

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Horror story with family curse

1jeantk
gen. 20, 5:25pm

Trying to find a short story or novel read in childhood, 50 years ago, involving a person who spends the night in an old family mansion. During the night he hears the strange dragging sound in a hallway, and eventually sees a creature, part human, part amphibian (I think) an ancestor with the family curse.
I was a voracious reader of Poe, but this is something else.
Thanks