There is a possablility in the 1901 census.

Castletown, distirct 4, schedule 42, Colleg Green
Richard Cain, head, married, 38, grocer wine & spirit merchant, Douglas
Harriet Georgina, wife, married, 35, Santan
Richard Claude, son, 9, Castletown
Wilfred Kissack, son, 7, Castletown
Harold Stanley, son, 5, Castletown
James Mylchreest, son, 3, Castlown