Age for Janet is 33 giving birth around 1828.
Yes. The census was taken around the end of March or beginning of April, about a quarter of the way through the calendar year. Therefore only about a quarter of people had had a birthday in census year, so they would be a year older by the end of the year. So it's a three to one chance that Janet was born in 1827 rather that 1828.
That matches the age of the widowed Janet Stevenson living with her unmarried sister Margaret Stevenson in 1881.
There is one 12-year-old Janet Stevenson in the 1841 census at Muir of Bannockburn, with parents Robert Stevenson and Fanny. There is a two-year-old daughter Margaret. In 1851 the same family is still at Muir of Bannockburn, Janet aged 22 and Margaret 14. You can see the full transcriptions at http://www.freecen.org.uk/cgi/search.pl
Can you find Robert and/or Fanny in 1861? If so, there will be death certificates which should give you the names of their parents.
Robert Stevenson
Birth 26 April 1786 in St Ninians, Stirlingshire
Death 11 July 1866 in St Ninians, Stirlingshire
Married
Fanny Birkhill
Birth abt 1801 in Stirlingshire
This couple are my hubby's 3rd gr. Grandparents.
I have 6 Children for them.
John, Robert, Cathrine, James, Janet, Mararet.
Hubby come down from Cathrine.
I am interested in hearing about "Muir from Bannockburn" is this a little village or....
If I have the same Stevenson family, happy to hear from you.
Cheers from Australia