The Spirit Is Willing

The Spirit Is Willing is a 1967 American horror/comedy film directed by William Castle, written by Ben Starr, and starring Sid Caesar, Vera Miles, Barry Gordon, John McGiver, Cass Daley, Ricky Cordell and Mary Wickes. Based on "The Visitors" by Nathaniel Benchley, it was released in July 1967, by Paramount Pictures.
Plot.
Ben (Sid Caesar) and Kate Powell (Vera Miles) rent a haunted New England house by the sea where their son Steve (Barry Gordon) cops the blame for mayhem caused by the pranks of three mischievous ghosts. Soon after their arrival, a series of strange and increasingly destructive occurrences begin to happen. Not believing in poltergeists, the puzzled parents immediately suspect their son. The real perpetrators are a trio of angry ghosts who want the cabin all to themselves. When the mortal family refuses to move, the ghostly trio (two women and a man) sink two boats belonging to the couples' wealthy uncle. Once again the poor boy is blamed and this nearly drives him insane for he can see the ghosts. More trouble follows when one of the lady spirits falls in love with the uncle.