Sending Hogwarts letters to Muggles

[Jim Ferer]

This question was the question from the chat that jumped out at me:

=======================================================
HPFreak7: How are muggle parents convinced to let their kids go to
Hogwarts, a strange place they never heard of before; and wouldn't
they think it was a practical joke?

JK Rowling replies -> In the case of Muggle parents, special
messengers are sent to explain everything to them. But don't forget
that they will have noticed that there's something strange about their
child for the previous ten years, so it won't come as a complete bolt
from the blue.
=======================================================

It supports one of my favorite guesses about how the wizard world works.

I also note JKR is as deliberately vague about potential romantic
pairings as ever.