Here’s an example below about mice inheriting a distaste for a certain smell for those who are interested. Regarding the Holocaust generational trauma study, I wouldn’t say that it was “debunked”- the author of the opinion piece posted above was just pointing out weaknesses like small sample size and saying that study was overinterpreted - not saying the research was somehow fraudulent. The field is clearly still in beginning stages. But, it’s not pseudoscience. Also including a more recent BBC article that gives some broader context. https://news.emory.edu/stories/2013/12/smell_epigenetics_ressler/campus.html
to bring it back to the show, I think it is reasonable to have a character studying this; however, the idea that you could see these types of effects in one family is a stretch; I would agree it is much more likely joanie’s issues were related to direct trauma rather than inherited trauma.