As a matter of interest, would a quarter acre plot be big enough for any smallholder, if there was perhaps the possibility of renting a bit of an adjacent field?
I'm quoting William Cobbett, "Cottage Economy" (first published in 1821 or so, and still in print):
"I purpose to show, that a large part of the food of even a large family may be raised from forty rod, or a quarter of an acre..."
He grows food for a house cow on that, too. But he kind of reckons fruit is a waste of space, and thinks bread and small beer is a good diet for your kids before they go out to work in the fields all day. (I think he bought in grain, so wouldn't have been totally self sufficient on that area...)