"Captain Kid the Pint-Sized Pirate" is a strip which ran in Whizzer and Chips (specifically, the Chips portion). Based around an inevitable pun on the name of real-life pirate William "Captain" Kidd, the main character is a pirate captain who is a small boy.
Kid's crew never approved of having a wee nipper in charge of the ship, and often conspired against him. However, the captain's muscle-bound "Mumsy" was always there to keep any mutiny at bay.
There is a possible reference to the strip in Alan Moore and Kevin O'Neill's 2013 graphic novel Nemo: Heart of Ice. The main character in the book is the daughter of Captain Nemo, and some of her crew members are implied to be the descendants of fictional pirates - for example, Old Tom and Jake Junior are presumably related to Tom the Cabin Boy and Cut-Throat Jake from "Captain Pugwash". Amongst the crew is a burly woman named Kidd, whose last dialogue in the book includes the phrase "oh, mother" - a possible relative of Captain Kid's Mumsy?