Did Nancy Lanza know about Adam's obsession with mass shootings?

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I don't really think so.

But she knew for sure something was wrong with him.

He kept his mass murder obsession a secret and Peter said he never talked about mass murder.

She was aware he had problems, as shown in this screenshot from Lanza's timeline, but I don't believe she knew about his obsession.
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Variache wrote:

She was aware he had problems, as shown in this screenshot from Lanza's timeline, but I don't believe she knew about his obsession.
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I wonder about this drawing. I didn't know he was into art as an adult, and I would like to know when and why he made the drawing. I would like to see the drawing and any others if he had them.

This is, in no way, indicative of her cognizance on the matter, but Adam specifically chose to read "Amish Grace: How Forgiveness Transcended Tragedy" for his 2008-2009 WCSU English course. His "independent reading list" for that academic year was most definitely something she was aware of. As an aside, Adam would have been 16-17 at the time, so Nancy would have been the one purchasing these books (including Amish Grace) for him, so she was perhaps very, very mildly aware of the fact.

There's not a chance someone like Nancy was aware of what Adam was into. I doubt he communicated much of anything to her about his interests.

Sylar wrote:

Variache wrote:

She was aware he had problems, as shown in this screenshot from Lanza's timeline, but I don't believe she knew about his obsession.
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I wonder about this drawing.  I didn't know he was into art as an adult, and I would like to know when and why he made the drawing.  I would like to see the drawing and any others if he had them.  

I know there was discussion over some other pictures that were allegedly in Adam's possession and it was ambiguous as to whether or not they were photographs or drawings, but all were of scenes of violence or death.