I found this in my tidyings of archives the other day.
When I was a girl we had a white cat called Dido. I was in my mid-teens when I did some scraperboard* sketches of her, and many years later, when my daughters were very small, they found these in a drawer and added their cat pictures in the spaces between mine.
I don't think they're particularly proud of their pictures now,... but they make me smile.
(* Scraperboard, Thimbleanna, is card covered with white chalky stuff with a black layer on top. You scrape off black bits with a sharp point to make a picture. This is not a particularly distinguished example of the art!)