Slightly maybe off(?) topic?
I've seen this happening over and over in genealogy research... epigenetics is the term that is used.
Currently researching a family from the late 1800s in DC. There were newspaper articles about the father being abusive. A birth record mentions the mother having 12 children, with two more to come. Mama died during the 12th pregnancy. Of the six children that lived to adulthood two of them took their own lives, one died from the effects of alcoholism. So sad.
I think it's extremely difficult for those born in such families to escape the consequences of their ancestors.
Also... searching for biological parents often times does not equate to a happy ending. I've experienced that personally, helping some friends in not parent expected / adoption situations.