No breakthrough I'm afraid.
The 1851 widowed John Terae is probably the one that married Catherine Cottier on June 2 1821 in Andreas.
They had Catharine christened July 18 1824, John, Jun 16 1822, Esther, Apr 27 1834 and Thomas Aug 14 1826.
In 1841 John 45, Catherine 40, Catherine 16, Esther 7 and William KERRUISH 2 !!("dependant" crossed out) are in Andreas. Ancestry has the name trascribed as Feare.

Possibly John was a brother of Margry, but I could not find any evidence.