When a ewe does not take good care of her newborn lambs some human, in most cases Lucille, has to bottle-feed them and take care of them.
When the lambs are weaned they "graduate" as alumni from Lucille's nursery. Tongue in cheek I started calling them her "kids"!
When the first of her "kid" delivered a couple of lambs, Lucille became a grand-mother, so to speak, she became GrannyLue!
We both liked that name so we decided to make it our domain name.