Was his mom a single parent?
He parents were divorced. Initial reports say he murdered them both but who knows how accurate that is.
TENTATIVE info: It’s looking like Adam killed both his mother and father, who were divorced and living in separate places, then went to the school where his mother was a teacher and slaughtered her entire kindergarten class. There are also reportedly a girlfriend and a friend who are missing. It’s not clear to me whether it is Adam’s girlfriend and friend, or his brother Ryan’s.
Also looking like Adam could not or decided not to get to his 24 year old brother Ryan, but instead carried his ID so that Ryan would be publicly blamed.
There is also a report that a second brother has now been found dead at the shooter’s home, bringing the total to at least 28 people:
http://www.hollywoodreporter.com/news/connecticut-shooter-suspect-identified-tearful-402639