A message from the other side? Nr 2

I was talking on the phone with my cousin and her mother had passed away and we were talking about her mother. Suddenly a knocking was heard on the door to my room. I opened the door but there were no one there. I shouted out to my family. Come on stop this nonsense. It is not a funny joke! Then I heard my mother and by brother from the top floor saying that they were watching TV and they did not know what I was talking about and my dad was not at home. I was on the floor below them alone. So suddenly this got rather scary. I told her how the knocking sounded and she started to cry and said that this is exactly the way her mother used to knock on her door. Really spooky!!!