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I think what the daughter was saying is that the abuse and craziness of her father would, in a sense, give some explanation for her own initially troubled path.

> The _one_ thing that could definitively prove the link and clear the mystery one way or the other.

Fingerprints should work, someone would just have to check.

>Also, the daughter says this would justify her life, which is a baffling statement. A life which apparently included drug problems up until at least 2007.

She doesn't say it would justify her life. She says it would validate her telling of her life:

“You know, when people ask you what your life was like, and you just don’t know where to start? This validates it"

In other words, it would corroborate the hurt and abuse and bad upbringing she got from her father.

She might even further mean it that it would help explain to others how she turned the way she is, regarding drugs and such: because she was raised by a loonie psychopath murderer.

But it's also perfectly logical for her to just mean that it will validate her telling of her harsh upbringing to something people can immediately grasp the awfulness of.