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The Xianbei families would still be mostly Xianbei in blood if most of the noble population was of Xianbei origin. And I think this was likely the case since the Xianbei were the dominant nobility of the Northern Wei. Say a Han family married Xianbei, which puts them at 50% Xianbei. If the Xianbei are the majority within the nobility, chances are, this 50-50 Xianbei-to-Han person will have to marry another pure blooded Xianbei, which puts them at 75% Xianbei (not unlike the Tang emperor). It's safe to assume there was just more Xianbei blood going around in the nobility, since they were the dominant ethnicity, and over the long run, the percentage will converge towards the original ratio of Xianbei nobles to Han nobles when they started mixing. (And let's not forget all the bastard children the Xianbei would have fathered all over China through prostitutes and mistresses)I honestly can't believe that articles such as this are still being published in the second decade of the 21st century. Han, and especially the concept during the Tang, was never a genetic one. The figure of 75% is also meaningless as it assumes that the Xianbei themselves were "pure blooded" whatever that implies. The Xianbei has been intermarrying with the "Han" for decades, there are no grounds to suppose that the Dugu or the Zhangsun clans themselves were "pure" Xianbei. Thus the figure of 75% is neither provable or even meaningful as ethnicity at the time was not determined by blood, but by patrilineal descent. Furthermore, after Tang Gaozong, Tang rulers were less and less associated with Xianbei.
I don't know where you getting this. None of those imperial-mothers were Han Chinese.In similar ways, many Qing rulers had more Mongol and Han "blood" in them. Kangxi for example, had a Mongol grandmother, and a Han banner mother. This mean he was only 25% "Manchu". Similarly, Qianlong's mother was a Han bannerman, that doesn't mean he was less "Manchu" as the idea of Manchu during the Qing was more socio-political than genetic. The idea of genetic purity and blood percentage is only a modern concept. To many ancients it is the paternal line which carries the lineage, while the maternal line serves as nothing but a child bearer, and hence the dynasty is defined through the paternal side.
A word isn't very useful if we're constantly have to step back and re-examine it... for the sake of communication, lets just agree that the Han are the Huaren as a starting point, and that someone who is majority Huaren in blood is Han.Also, one should step back and take a look at the word "Han", ironically, the first dynasty which used the term to refer to itself was the Tang. Native Dynasties after the Tang and before that, never used the term Han to such an extent, and when it was used, it was usually by the steppe people on the Chinese than by the Chinese to refer to themselves.