Hi Liz,
Sorry I've not been able to find your Robert Cain but did find this information on One World Tree on Ancestry, don't know if this helps with your search.
Name: Edith Ann Cowle
Birth Place: Patrick, Isle Of Man
Death Date: 24 Jan 1942
Death Place: Mental, Braddan, Isle Of Man
Father: John Stanley Cowle - Born ? - Died 3rd Feb 1909
Mother: Margaret Elizabeth - Born ? - Died 1908
Spouse: John Henry Cain
Born: ? - Died: 22 Jan 1924 in Archway, South Quay, Douglas, Isle Of Man
Children:Robert Henry Cain
Born: 22 Apr 1894 Douglas, Isle Of Man
Died: 13 May 1973 Douglas, Isle Of Man
The list continues down if you would like more information?
Good luck with your search.
Julia