For more of this character [link]
Inspired by a mix of stories different trans-boys have told me.
Nothing is more important than supportive parents. Mind you, it's probably ten times easier for Niels because he never knew Magnus as a girl, so he didn't have to mentally change his idea of Magnus from "My daughter" to "My son".
EDIT: I had hoped I didn't have to explain it, but the point is that Niels screwed up the size, but because he gave Magnus a gift that show he support him, Magnus still prefer it over all the other gifts even though he can't really use it.