You already failed with your first interweb link which supported my argument. Do you have another failed attempt? Do you have a definition for ancestry that doesn't involve biology?? Please share.
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Jeff, maybe I can help you out as someone who grew up mutli cultural, multi racial and multi ethnic. First, don't listen to white people about defining these things, they have no experience with this stuff so they just randomly make shit up that makes no sense. You have to parse the actual living examples and not govt. supplied criteria. These are the same idiots that drew lines on a map in the ME. So forget that shit.

For example. My nationality is American. I was born in Thailand, but my parents are American so I was born as an American abroad, same as John McCain. Thailand was just the place my hospital was located in. I am not Thai however, as I never pursued the requisites to maintain that nationality (they require you demonstrate a speaking knowledge of Thai and make yourself available for their public service either as a soldier or monk). Racially, I'm Euro-Asian or EurAsian or half-yellow/half white or half white/half-asian depending on what BS metric you want to employ. My ethnicity is half Austrian and half Vietnamese as that's where my grand parents came from. The Austrian thing is tricky though. They came over from the Austro-Hungarian empire so that was their nationality, but their name, geography and lineage suggest they were from modern day Poland. So my grandfather's side culture is Austrian, but my ancestral lineage is more tied to the Slavic peoples rather than the Goths. In fact, my grandmother might have been considered Russian. The Vietnamese side is much more simple and straight forward. So ethnically I'm an Austrian Slav/Vietnamese. My cultural identity is Austrian-Vietnamese-American. All three.