If you look at the research section of iomfhs.com the births show that he was the son of Joseph Alfred Cubbon and Catherine Ann Kaye born on Aug 4 1886.

The father was was buried 1888 aged 32 so by 1901 at 23 Princes St. Douglas :-

Katherine A Cubbon 37 widow boarding house keeper Braddan
Kathleen A Cubbon 16 tobacconists shop girl Douglas
Joseph A 14 printers compositor Douglas
Mabel K. 12 Douglas

Len Faragher