You likely have all this.
1891 census Edward is a widower and his two daughters Alice 23 and Annie 21 are living with him.
Are Catherine and Annie the same person?
On Robert BIckle's marriage rego mother's name is given as Cornell- that sound close to Parhale.
On their marriage rego her name is given as Palmell.
On Bickle Family Tree on Ancestry.ca, Elizabeth's maiden name is given as Penhale, born 9 Sept 1827 Whitchurch Devon England, died 14 Oct 1890 East Zorra, Oxford Co, Ontario.
Edward Bickle's death date is given as 13 Aug 1891, East Zorra.
The sons didn't die until mid 50s so their registrations won't be on line yet but you can get a copy of them from Ontario Vital Stats. The death regos should list mother's maiden name.
There are 2 Elizabeth Parhale's on 1851 census, living in Ingersoll. The one you mention, aged 20, who is listed as servant and another Elizabeth Parhale listed below.
1851 census Ingersoll Oxford County Ontario
FOWLER
James, England, 45, joiner, E Methodist
Mary, England, 38
Andrew, 16, Eng
Wm, 12, Eng
PENHALE
John, Canada, 7
Rebecca, England, 27
Nora, England, 23
Elizabeth, England, 25.
You can view their headstone in East Zorra Baptist Cemetery on this site
http://freepages.genealogy.rootsweb.ancestry.com/~dcoop/ezba...