Wow, I'm truly at a loss of words. This story really moved me and made me think. I'd like to comment on a few things that stood out to me:

First of all Snape's character. Keeping Snape in character is one of the most difficult things in HP fanfiction, I myself failed terribly when I tried, but you seem to have a really good grasp of his character. Both the young and the older Snape were very in character and a definite maturing could be seen in him from the 11-year-old to the adult Snape who is recalling all this. I felt sorry for him the whole time, although he didn't seem to pity himself, which is good because I don't think Snape is the type to pity anyone, least of all himself.

Then I liked how you handled the issue of domestic violence. You only hinted at what Snape's dad did to him and his mum and showed it indirectly through his mum's reaction to her husband's death. I prefer this subtle approach to actually showing the physical abuse, because it has a bigger impact on me and really makes me think. If there's to much violence I just skip parts or stop reading altogether.

What else is there to say? I simply loved your fic, although it made me incredibly sad, because such things occur in some families and I can't do anything about it.