Who is the fifth grandma I only count four ...I just had a revelation!
There are five "grandma's" in this game. Of the five, only four of them actually look like grandma's.
The odd-one out here is Nana, of course.
The only answer is that she's not really a grandma, so no-one should be complaining that someone not a grandma in a game called "Grandma's House" hasn't had SEX™ with the MC regardless of how long the game's been around ...
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Nana, Minnie, Ophelia and Mabel.
Who did I miss ?