There’s really not much to say about this episode because there’s no real conflict concerning the Clow Cards. As a matter of fact, it’s pretty relaxing, with Sakura and her family going to the countryside for a vacation. She meets and befriends a kindly old man living alone there, who in actuality, is her great grandfather.
The meat of the episode is certainly the expanded information and subplot we get on Sakura’s family. The old man Sakura meets in this episode (named Masaki Amamiya in the manga) is her mother’s grandfather and was against Nadeshiko’s marriage with Fujitaka. Though, after finally meeting his sweet and innocent great granddaughter (Sakura, obviously!), he starts feeling some regret about it. Revealing to Sakura that he misses his deceased granddaughter (Sakura doesn’t know that it’s actually her mother), who drew him a picture of a rainbow because he loved to look at them, she decides to do a kind gesture for him before she goes home. With the help of Clow Card magic, of course! Needless to say, it’s very heartwarming.
It’s interesting, though. In the anime, she uses The Rain to produce a rainbow, while in the manga she uses Watery. Understandably so, since rain is, well, water. Which begs the question, why did Anime!Clow Reed find it necessary to create the The Rain card? 😛
Also, while her mom is off on “family business” (setting up her grandfather to meet with Sakura), Tomoyo stays at home watching Cardcaptor Sakura.
No, seriously. The Cardcaptor Sakura anime was filmed and produced by Tomoyo Daidouji. What? What is this “Madhouse” you’re referring to?