These were supporting characters from my comic strip: Home of the Brave. Gramps was an ex-super soldier/spy who had been living in the attic for well over 3 decades. Everyone thinks he's senile, except his grandson, who knows that all the wild stories Gramps speaks of in the past are actually true.
In Bobby's Biggest Bubble, I use Gramps as the local park curmudgeon, Mr Krumple. I was tempted to name him Mr. Seaman, an actual grumpy neighbor who yelled at us back when my friends and I were teenagers. (But, that last name just wouldn't be appropriate for a kid's book.)
In Home of the Brave, Mrs. Sugarpants ran the local store. She had terrible hearing and the worst eyesight in town. She also had visions of grandeur, believing her store was so popular that it was always filled with celebrities.
In Bobby's Biggest Bubble, I gave her the same job - the local store owner - but with one important change: her name. It had to be changed for the children's book . . . so I toned it down from Sugarpants to Applebottom. It's a safer name and I think kids will enjoy the newer name.