As I understand it, DNA is not shared between dopplegangers ancestrally (as in siblings or twins) but coincidentally through combination or epigenetics. I wond

As I understand it, DNA is not shared between dopplegangers ancestrally (as in siblings or twins) but coincidentally through combination or epigenetics. I wonder if there is opportunity for something similar to twin studies whereby the same/similar genetic information is used to understand affects on other characteristics. Earlier story from 2020: https://www.bbc.com/future/article/20160712-you-are-surprisingly-likely-to-have-a-living-doppelganger https://www.bbc.com/future/article/20160712-you-are-surprisi... 2015: https://globalnews.ca/news/2300048/your-doppelganger-exists-according-to-science-heres-why/ https://globalnews.ca/news/2300048/your-doppelganger-exists-...