Hi again, Emma,

At a minimum, you need to send for the birth certificate for Olive; If you are thinking that Ingram Radclifffe might also be a son of Henry and Sophia, you should probably send for that cert as well.

Look on the ManxBMD.com site to see how to order the certs:
"If you think you've found a relative and want more information....

If you want further information on the event, you will need to order the certificate from the Isle of Man Civil Registry. If you supply the reference number it costs £7.00, if you don't then it's £9.50 per certificate. Send your cheque or PO (made payable to the Isle of Man Government) along with the details from the index to:

The Douglas Civil Registry Office, Deemsters Walk, Douglas, Isle of Man, IM1 3AR

If you don't want to apply for a certificate just yet, especially if you're not sure the person is your relative, then you can try the census. The Isle of Man Censuses can be found on Ancestry.com"

From ManxBMD.com: (search for births)
Ingram Radcliffe Gillon b 1913 A:573
Eva Winifred Gillon b 1915 A:595
Edith May Gillon b 1917, d 1917 age 0 A:608
Constance Gillon b 1919 A:621
William Gillon b 1922 A:649
Olive Gillon b 1926 A:697

I don't know if it is possible, but if you could obtain a copy of the obituary for Sophia, it might give more information. (or an obituary of your grandmother, if you know the date of death.)

By the way, both Henry and Victor were in the Childreas Home in Douglas, in the 1911 census. I wonder why--perhaps Sophia was sick?? (And where was Frederick?) Jessie, at age 20, was with her grandmother Radcliffe.