Don't Look in the Attic (1982)

Horror movie about a cursed house in Turin and the three relatives who inherit it. Two brothers and their cousin Elisa (who haven't seen each other since childhood) are brought together after their mother's death. They inherit her house under the condition that they live there together and never divide or sell the property. It's haunted and after many ghostly nightmares and some murders, Elisa finds a diary in the attic, learning that she is the sole survivor of "the seventh damned generation."