In her book about Andreas, Sally McCambridge writes:-
At Casement Croft, Ballacorey Road, Andreas.
"John and Esther Casement (Creer) were joined by widow Margaret Cubbon who stayed until her death in 1899. In earlier life, Margaret's husband had been transported and her children raised by James and Isobel Kneale of Myrtle House, the Dhowin. The mother of Esther Casement was a half-sister of the transported William Cubbon."
The children can be seen in the 1851 census.
Len Faragher