[pritovido]

>Has reading source code in a language that’s unfamiliar to you shown to be of any real benefit to learning?

Yes, I think so. The parent has experience with other languages, like python, javascript and go. C has a very similar paradigm. If it were clojure it would be different.

I find exposition to new languages real usage the best way to learn them. I went to the UK to learn english, Germany to learn German, could be painful at first, but works, specially if you know a little about what is all about.

Your brain makes sense of everything by itself in a magical way. That is the way you learn your native language.