<human>: Can you condense the text into a few key points?

Background: He and I started dating mid-October. We've known each other for just about a year now. We met in a research lab at the school we go to.

He's pretty extroverted, but guarded with his personal life, not in a defensive way...but in a doesn't talk much about it kind of way. I'm thinking this might be because he doesn't want me to judge him since he and I are from pretty different backgrounds. Growing up, my family was pretty well off. They live in a nice part of town. My parents are still married. Both of my parents are college graduates, as is my older brother. 

He lives in a rougher part of town. His parents aren't together anymore. I don't like poking much, but he's subtly implied that his father is dead. He's the first person in his family to go to college and his two younger sisters have followed his path. I'm incredibly proud of him. 

His mom is an alcoholic. I had a feeling she was based upon the bits and pieces that he would say. When I saw their house, it was obvious (filthy, cluttered, didn't seem to make any sense). Apparently she's started drinking again heavily...to the point where she blew out the front tires on her car trying to buy more alcohol yesterday and has no recollection of what happened. He told me he was taking the battery out of her car to make sure it didn't happen again. 

He's saving up right now to move out with one of his sisters, but until then he's stuck. 

My issue is this: How am I supposed to respond to him when he tells me about these things? What can I do to be supportive without overstepping any personal boundaries? I never grew up around anything like this and can't really relate. I feel awful for him though given his incredibly shitty circumstances. I guess I just want to be there for him in whatever ways I can without making him feel pitied or embarrassed.
<bot>: The guy I'm dating's mom is a severe alcoholic. He's still living at home and periodically vents to me about it. What should I say or do to make him feel better about it?