Ellerslie (see Manxnotebook) was modernised + named by Anthony Dunlop in early 19th C - a large farm opposite Old Marown church - acquired by Cunningham (of Cunningham's Camp) in 1915 and updated using internee labour - went on to be a major supplier of food for Cunningham's Camp during the 1930's etc - very unlikely to have been owned by your family tho it would have employed quite a number of men.