Assuming Elizabeth Eddowes mentioned her grandchildren in date of birth order in her will, William was born in 1910, possibly as Lillian died giving birth.
Births Sep 1910 (99%) CROSS James H Birkenhead 8a 497
James was 7 months in 1911
He died at the age of 99 on July 8th, 2010 in Ontario.1
Death Notes
James Cross died in Kingston, Ontario, Canada on 8 July 2010.