I'm looking for a old zombie movie which I saw when I was a child for a long time.

The movie was about a family trip to an old castle, they accidentally awoke the zombies below the castle. The zombies were smart, I remembered a scene that a maid or something trying to close the window but her head was cut off by the zombies with a scythe.

The movie ended with a scene where a mother was ate alive by her zombie son and other zombies.