Since we know Sumireko is a Gen Z and Renko is probably her descendant (they both have Usami as surname), surely there has to be some pretty funny interactions between the zoomers and Gen Beta (yeah we skipping the Alphas which would be the moms of Renko and Maribel I think) :P
Sumireko is gonna be around like 70 years old in these short stories. The stories will be in the form of comments of this post
nitori OP wrote
Skibidi War Veteran
Sumireko, sitting in a wheelchair: "Back in my day we fought the skibidi menace of the Alphas together with our Millennial comrades. Because of our efforts you Betas can still speak like normal people"
Renko, pushing her grandma's wheelchair: "Oooohio, that was not very rizzling, sigma fanum taxer, you gotta skibidi back to your toilet"
Note: In plain English, Renko is pretty much saying "Ooookay, that's some meds you got, grandma, you're going back to bed"