Hi.I'm not related to this family. Here is her birth record:
Ontario, Canada Births, 1869-1911 about Mary Jane Flint Name: Mary Jane Flint Date of Birth: 18 Mar 1891 Gender: Female Birth County: Renfrew Father's name: Joseph Flint Mother's name: Elizabeth Mcleod Archives of Ontario Microfilm: MS929_107
Here is her parent's marriage:
Ontario, Canada Marriages, 1801-1928 about Joseph Flint Name: Joseph Flint Birth Place: Wilberforce Tp Age: 38 Estimated Birth Year: abt 1848 Father Name: Joseph Flint Mother Name: Elizabeth Richards Spouse Name: Elizabeth Mclead Spouse's Age: 38 Spouse Birth Place: Fitzroy Spouse Father Name: Donald Mclead Spouse Mother Name: Catherine Mclead Marriage Date: 5 Jan 1886 Marriage Location: Renfrew Marriage County: Renfrew Archives of Ontario Microfilm: MS932_55
And her grandparent's marriage:
Ontario, Canada Marriages, 1801-1928 about Joseph Flint Name: Joseph Flint Spouse Name: Elizabeth Richard Marriage Date: 19 Oct 1840 Marriage County: Bathurst Archives of Ontario Microfilm: MS248_01
Here is the family in 1851:
1851 Census of Canada East, Canada West, New Brunswick, and Nova Scotia about Joseph Flint Name: Joseph Flint Gender: Male Age: 4 Estimated Birth Year: abt 1848 Birthplace: T Wilberforce C Province: Canada West (Ontario) District: Renfrew County District Number: 33 Sub-District: Wilberforce Sub-District Number: 323 Household Members: Name Age Elizabeth Flint30b. 20 Nov 1822 New Hampshire; Tavern Keeper; Presbyterian Robert I. Flint10b. 22 Sep 1842 T Inslow C Moses Flint8b. 8 Jan 1844 Tolbolton C Mary Jane Flint6b. 29 Apr 1846 T Wilberforce C Joseph Flint 4b. 26 Jul 1848 T. Wilberforce C.
I have never seen a census taker write down birth dates in the 1851 census, so you are very lucky indeed!