Karen is informed by owl that she's a prefect. She writes her friends about that, of course.
"Timothy has more to lose than most people but if you're very very sure of this person I think he would be delighted to have a plan for that."
"I don't necessarily have to name him but it's possible she'd guess if I bring it up at all."
Miranda picks her way very delicately through a conversation with Karen and keeps it very hypothetical and 'do you want to get married anyway eventually' and does not think she guesses. Which is good, because in the course of this conversation it comes up that Minor knows about Karen, which. Would be complicating.
Maybe she can come back to the Ways' with Minor after Boxing Day does that sound fun?
Her dad's house isn't connected to Floo - nothing in his town is, actually - so they have to fly it under disillusionment.
"Mum grew up here," she says, when they land somewhere unobtrusive from which they can de-invisible and walk the rest of the way. Miranda owns actual Muggle clothes and has loaned Karen some; Minor's she transfigures and now he is wearing pants. (Someone has shoveled a path through the ice from here, isn't that nice.) "That's how they met, but it didn't work out."
"She was pretending to be a Muggle at home and kept doing it after they got married but she got really tired of it and knew it couldn't keep up forever once they had me, not if I wanted to be able to pass, so she divorced him and moved to London when I was a baby."
"But they get along all right, I can owl her letters she forwards by Muggle post and she brought me here to visit when I couldn't travel on my own."
He has a cute white Muggle house with a snowed-over vegetable garden and blue and green trim and chickens in the backyard. It's subtly seen some magical tuneups, but nothing conspicuous.
There he is, sitting by the fireplace; he gets up to sweep her into a hug. "Miranda! And you must be Karen and Minor -"