Artist's commentary
The Frog Lineage
While fooling around is also nice, there are times where the atmosphere is strained!
Sanae-san and Suwako-san are both similar deep down inside.
"The cutest in the world is my Kanako."
"The cutest in the world is my Reimu-san."
Because of reasons like that, there are plenty of times when things get strained between the two. Suwako-sama is in the "Quiet but really angry and scary Curse God of her heyday" mode.
In any case, Suwako-sama has to have Kanako-sama intervene and Sanae-san is comforted by Reimu-san. The four will always start by being chatty and friendly and won't develop into Suwako-sama blaming her descendant.
Folks generally claim that "My wife is number one." But, that is a mutual love of old. These two will be quite aggressive with their claims.