We have that tradition here in North Carolina as well, although not as much as we used to have.
I know a man whose mother's name is Julia, and he married a woman named Julia, so they were Big Julia and Little Julia. Little Julia was an assistant principal at my school, and Big Julia was and is a substitute teacher here. We had to specify which one of them we were talking about, and sometimes there was a good bit of confusion.
In may family, we called my late grandmother Mamaw. When some of her daughters and daughters-in-law became grandmothers, they were Mamaws, too. Somebody came up with calling my grandmother Big Mamaw, and the others Little Mamaw, even though they were all taller than her.

Back to the subject at hand...
In Sandy's picture above, what relation is "Young Campbell" to Campbell Mor, or "Big Campbell"?