Hello, I found the following information on MyHeritage in a book, History of My People and Yours, Including the Families of Nicholas Lake:
Letty is listed as a child of Nicholas and Mary Lake, page 239: Letty married John Sine April 28 1818
page 242 indicates this date as April 28 1812, reading: "Letty Lake (probably Elizabeth), b 1792 in Twp. of Sidney, City of Hastings, Ont., m. John Sine, of Sidney, April 28, 1812. Do not know that she petitioned for land. Have nothing further."
I've provided the following link, I believe this source will be of interest to you:https://www.myheritage.com/research/record-67532-569/history...
Do you have a Sarah Sine b. 1824? I'm hoping to find a match to Sarah who m. Charles Chester Nicholson.