Another suggestion is to buy the death certs for the two daughters CATHERINE RADCLIFFE, / died June 18th 1913 / Aged 78 years [MI], and MARGARET RADCLIFFE / Sister of the above / died Oct. 5th 1928 / Aged 73 years [MI], to find out who were the informants for these, and their addresses.
Someone was still around to arrange the gravestone inscriptions!
If the deaths were not in the IOM, try England.
Do you have the death certs for John Cecil and his wife?
Sue