I think you're trying way too hard to find an exact parallel to the situation in East Asian languages, and languages just don't work that way. You're never going to find the exact same
situation because you'll never find the exact same set of historical events, relative geographical location, etc. But you do find something very similar even in English.
In other language-related news, it seems that my dad understands Tamil about as well as I do now. I got him to listen to some of the clips on the Tamil Language in Context
website. He says he understands Tamil as long as it isn't spoken fast, so he could understand the last two dialogues in Unit 6 (there are twelve units in all), except for the English word "sandwich" in the last dialogue in that unit (which I also struggled with at first, like wtf is "sendichu" or whatever?).
In more general language news...I'm starting to worry that languages aren't all that interesting to me anymore.
Like, at this point, I've gotten familiar enough with languages in general that I'm actually having trouble finding a new language to learn - in particular, finding a language that is completely unfamiliar to me at this point (but that I can also learn, I guess?). Maybe it's about time that I started focusing on how to use my languages instead of on how to learn them.