I'd love to know more about Harry's muggle grandparents

Anyone else? I’m curious to know how they could raise both Lily and Petunia. I’d love to know more details about their relationship with their kids.

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It's a subject sometimes explained in fan fiction (such as The Last Enemy)

The thing is that they are the parents to both Lily and Petunia, so they have to be nice, but also flawed.