The 1901 Census index at:

http://www.census.pro.gov.uk/index.jsp?URL=/StaticPageServlet%3FrType%3DBAS

has..

Edwin CALLOW 18 yrs b. Laxey residing German Cow man on farm

Florence CHRISTIAN 13 yrs b. Ramsey residing Maughold

If you are prepared to pay for copies of the Census transcripts it may provide info on their families of origin, especially Florence who is likely to still be living with her parents.

There is no sign of their burial in Maughold. Do you know where they could be buried ? As someone may be able to access a monumental inscription and date of birth.