Sheila, right at this minute, I cannot tell you too much about the family you are looking for, but the name is ARMITSTEAD, not Armstead, so maybe that is why you cannot find it on the 1881 census. Have you tried the 1901 census? Castle Huntly Mansion, is Castle Huntly - i.e. a proper Castle, which was, sometime ago, turned into a Prison. It still retains its characteristics, on the outside anyway. It has a long history going back hundreds of years. Try doing a search for both Castle Huntly and Armitstead, and you will come up with some information. Regards, Dorothy (Longforgan)