Angie,
There are Waltons still farming in the area.
I know an Alf Walton who has a farm at Low Hardwick (at the back of Hardwick Park) just outside of Sedgefield. He stopped farming a few years ago, and now runs an outdoor quad bike track on the land.
Have you seen this site,
http://www.fishburn.org.uk ?
It lists residents in the area over a number of years, I see by 1914 the farm was in the hands of a John Todd.
I know most of the farms in the Trimdon area and can't place Glebe Farm, have you located it on any maps?
I wonder if it was actually in Fishburn on the site where Glebe House Old Folks Home was built?