This was a story told extremely well. It feels so horrifically real - the mention of the grandfather's drinking, casual verbal abuse, the mother lashing out at the daughter later, comparing her to the father, her guilt, just everything. Every new scene, I felt a pit in my stomach dreading what was next. The characters are also very well written.
I'm glad that you chose a more "simple" art-style. It does its job well but still leaves out the gory details that a realistic art-style wouldn't have.
This kind of story requires some finesse and I think you managed it well. Good job!