I was just wondering why they do this we used to have one that lived in our old house that took on my appearance and my mother and father would always see it then got the house blessed andit went away until we moved into a new house and they started seeing it again got the house blessed and it went away.. I just want to make sure that I have nothing to worry about

Usually if they take form of a living or non living member of the family (appearance, voice etc)... it isn't a good spirit. If you truly believe you have been followed you need to take the strong initiative to say leave this house and never come back, you are not welcome here if you have not passed through the white light of love and protection and I invoke Arch Angel Michael and his Band of Mercy to take you out of my home. (I know how crazy I sound) :)

Best of luck