Europeans of aristocratic heritage tend to be genetically more similar?

[Blanco]

Europeans regardless of different nations were able to move from each state to another therefore mixing between upper classes was a common norm to establish a sort of "bloodline" and it's very clear when we analyze the background of royal families. Some Russian royal family members genetically would have been perfectly West European, while the opposite could've been existed in some other nations.
For instance the British royal family has bloodlines coming from nearly any regions of Europe including Armenia and some family lineage researches predicted even Indian heritage among a few.

So I'd assume people of Aristocratic heritage - At least their descendants most likely would be genetically different from the local middle classes but most likely would show similarities to other parts of European aristocratic families, if we can assume that migrations and nationality is rather a construct of cultural boundaries which wouldn't stop the mixing between upper class individuals.

The most noticeable for this case is in Asia where most upper class Asians tend to be of Chinese or at least partially Chinese origin and differ quite much from the locals.

 

[Gaga]

But would they be truly genetically dissimilar? Some may. There is genetic similarity between Germany & England hence why some Germans will look rather "British" and some Brits will look rather "Germanic" on ethnicity sites. You also got to consider how much "unusual" [Indian, Armenian] DNA is there? When were those ancestors? Some Brits, for example, of Gypsy/Sinti backgrounds are Asiatic and they appear Asiatic on sites like gedmatch. Some Brits, due to NPEs, may be even odder than the Royal Family, for example, seeing as even back in the 1600s there were quite a few Poles, Slavs, Italians, Greeks, etc. in the country.

So really hard to say. Only countries, such as Asia, where the upper class is indeed distinctively separate would you see this. Or then maybe not. It is not like potential Chinese genetics wouldn't be found in the mainstream population.