> You don't just magically get citizenship for your parents home country, at least not for most countries.

Are there any countries where this is not true? I struggle to think of any, especially amoung highly-developed democratic nations. (There might be a couple of weirdo dictatorships that do not allow it.) It seems this would be necessary to prevent statelessness. For example, if your parents are living in the Netherlands as foreigners, children born there are not entitled to automatic Dutch citizenship. As a result, they will obtain citizenship through their parents (in a foreign nation).