Hm. I’d guess subcontinentals – this is partly where my ignorance of ethnic identities as seen from Britain fails me, I know British “Asians” were often called “Pakis” but I don’t know how much Muslims/Hindus/Buddhists/Jains/Sikhs are differentiated, not to mention all the different nooks and crannies of Jāti.

Which is the thing, you’d expect such a densely populous culture to have more outbreeding, but it’s really a ton of little endogamous grouplets that could have local social structures that are pretty narrow but with very powerful ingroup gravity, I can see that giving rise to incest. That and the lack of Christianized outbreeding pressure, and how to this day Indian guys on the internet can be so unmaskedly yay-rape, including of relatives.

So who was it?