I assume you have seen the article:

Isle of Man Family History Society Journal Vol 7 No 3 July 1985

THE KEWLEYS OF BALLAFREER

Of more than ordinary interest is the Kewley Ballafreer Commonplace Book,which is now in the library of the Manx Museum. It lay on the library shelves of Ballafreer old house for many years. It wee shown to the librarian by the late Miss Clucas, owner of Ballafreer long before the museum was established. Misa Kew, a relative of Miss Clucas was a later owner and she expressed her agreement that the manuscript should go to the museum. The last owner of the estate who belonged to the original Xewley stock was Miss Stewart, who soon after the death of Miss Kew, gave it to the museum. etc.