The moptop siblings Charlie and Mouse are back, this time spending quality time with their visiting grandfather, Grumpy. In four chapters, the brothers compare notes on getting "bigger" and the merits of being "medium"; inform Grumpy of the finer points of the proper pounce; enjoy Grumpy Night while their parents go on a date; and, at their visit's end, give the man a sweet and tender send-off. These boys are best buds, and Grumpy engages with them...