Early thread here at FR had older brothers Facebook page link.
It showed two states for him.
Maybe he was home for Christmas break and that’s how the younger brother got the ID.
My thought is that they all lived in Newtown, and when the family broke up a few years back, the father went to nearby Stamford, and the brother went to Jersey, while Mom and shooter remained in the original neighborhood. I saw another account, the brother said he hadn’t seen the shooter since 2010. Not sure what the truth is, the media seems to be pretty good at throwing things at the wall, and seeing what will stick. Thanks for your reply.