Fannie and Lester Brown are my Great Grandparents too. Irene Gertrude, their daughter, is my Grandmother.
I know that she has a fairly extensive family tree, and i am in the process of getting it from her. Any chance you know Lester's mother's (Edith) maiden name?
Something in the back of my mind says there were Wentworths somewhere in the generations just preceding Lester and Fannie.
I also am seeking Cora's parents. Cora and Fred, I believe, were married in Canada.
Hoping you still check in on this,