I went to Free BMD and looked up the records for the marriages and births of the children in Leeds. I am assuming that you may have the info but will post it just in case you don't have it. There is also information on a tree for the Windsor family at Rootsweb as well.
Hannah Elizabeth Windsor
Registration Dec 1877, Leeds, Vol 9b page 546
1st marriage
Registration March 1897, Leeds, 9b/464
Hannah Elizabeth Windsor
Ted Germaine
Death
Ted Germaine
age 22
Registration Dec 1898, Leeds, 9b/341
birth
Alfred Potentier
Registration March 1880, Leeds, 9b/510
marriage
4th quarter Dec 1901, Leeds, 9b/810
Hannah Elizabeth Germaine
Alfred Potentier
children:
Lily b. Dec 1901, Leeds, Vol 9b/509
Harold b. Sep 1903, Leeds, 9b/554 d. Mar 1904, Leeds, 9b/396
Alfred b. Dec 1904, Leeds, 9b/428
Leonard Windsor, b. Dec 1906, 9b/452
Ada Potentier. Dec 1910, 9b/340
Registration is by quarter so the birth can be anytime in that quarter.
www.ancestorsonboard.compassenger list appears to be in 1912 Liverpool to Canada, port Quebec
from the Windsor family tree at Rootsweb
Children born in Canada
Clara, m. Edward Knowles, son of James Knowles and Mary Caines, he died 8 May 1986
James Potentier
Albert Potentier, m. Edith Windsor
Leonard Windsor Potentier
b. 21 Oct 1906, Leeds, d. May 18, 2001, Cambridge, Ontario
m. Margaret Walker, b. about 1910, d. 1985
Ada Potentier
b. 1910 England, d. 1989
m. Walter Knowles, son of James Knowles and Mary Caines, he was b. 1904 Brantford Ontario, died 1986
looks like 2 Potentier siblings married 2 Knowles siblings
from the Legion Last Post Death Notices
Corporal Alfred Potentier
Date deceased January 4, 1984, age 79, b. about 1905
Service # B42618, period of service WW2, Dufferin and Haldiman Rifles of Canada
Legion Branch, Galt, Cambridge, Ontario
I would definitely contact the Potentier's listed in the directory at Canada 411. Also, you can probably get obituaries and information from the local library. Hope this information helps in your search.