Dinah was a widow in 1851 - also an innkeeper in Douglas st (this I think must be the Whitehouse - see my pubs page on manxnotebook) - two daughters match - don't trust the absence of 'deceased' as meaning father is still alive - if you see deceased they are dead but its absence does not necessarily mean the opposite
additional info - Thomas Crellin was a Waterguard (Coastguard) in Ireland (son William born 25 Dec 1833 at Analong Co Down and daughter. Dinah Armstrong (born England). Thomas bur 4 May 1845 aged 54, Mathias 17 March 1851 aged 86, William emigrated to Australia in 1855. Goodwin notes "there was a Crellin 'Mat Moar' (big Mat) who kept in the forties of last century a public house in Douglas Street, Peel (now Corletts)."