Grandma Sparkle was born in 2205. She refused to leave the wharf, despite the recent super mutant and raider incursions. She's protected by her deft hunting rifle skill and her family, who are out searching for mirelurk meat. She's tasted all kinds of critters and swears that mirelurks are the most delicious.
She occasionally says, "Y'all come back now, y'hear?". Every episode of The Beverly Hillbillies (as well as some episodes of The Dukes of Hazzard) ended with this very phrase.
The following is based on Fallout 3 cut content and has not been confirmed by canon sources.
Grandma Sparkle appears in a form list whose only other entries are for the unimplemented Rock Crick hunters, indicating that they are the "boys" who "are out hunting 'lurks."
A partially completed dialogue option in the Broken Steel add-on was to have allowed the Lone Wanderer to ask Grandma Sparkle what she thought of Split Jack's gang. Sparkle's reply is not present, leaving her opinion on the matter a mystery.
End of information based on Fallout 3 cut content.
pcps3xbox360 Grandma Sparkle comments that some people came around asking her about "some do-gooder from one of them vaults". This is supposed to indicate that Lone Wanderer with good Karma is being hunted by Talon Company hitmen. An alternate dialogue about someone looking for "some troublemaker from one of them vaults" is supposed to be said for a karmically evil Lone Wanderer. However, the dialog is set so that she checks her own Karma instead of that of the Lone Wanderer. Since she is a good non-player character, the evil dialogue never plays. [verified]
pcps3xbox360 Sometimes, Grandma Sparkle will be sitting in the ground, under her chair. She acts exactly the same, and gets up as usual. [verified]