Manxnotebook:
Bejamin Greetham was a merchant from a family of merchants in Liverpool, Margaret was apparently his 2nd wife, his father was Isaac. Gore's 1790 directory lists under name Greetham:

James , gent, 21 St James St

Isaac, merchant, Harrington. Herringhouse, 12 Grayston-street; Cooperage 23 Grayston st

Benjamin & co ship chandler and paper warehouse, 17 South Dock

J. victualler, Christian street, Islington

In 1796

Bejamin, Ship Chandler, Harrington, Park Road ; rope walk 5 St James street

Charles Merchant, St James', Harrington Park Road; Porter and Earthernware warehouse, 5 Salthouse lane, South dock

James, gent 23 St James st

Isaac, merchant Harrington; compting house 12 Grayson Street Shaw's alley

Thomas, Ship Chandler St James Harrington, Park road