How should I calm my little brother down after a parent's alcoholic fit?

Anonymous
Occasionally, my mother will become wasted off her ass, and of course, act very strange. Tonight in particular was awfully alarming. She stumbled to my little brother (13 with high functioning Aspergers) and began to wrestle my grandma's cat we're watching for the week. The cat was scared shitless, growling and hissing and clawing while my mom continuously tried to force the cat to eat. As I and my little brother tried to separate the two, and con my mom into going to bed she'd begun to slur out the idea that she didn't care about herself, and that her getting her was just fine. Saying that "Only her children matter." When we kept pressing for her to go to bed, she'd then say she was coping with her back, which had been permanently damaged several years ago. This of course, stressed my little brother, and she shooed me out of the room once he started to bawl. She'd then speak to him incoherently while my brother continued to plead. She eventually went to bed, but my brother has school in the morning, and I don't want him to be stressed out. Any pointers for making him feel better after something like that?
How should I calm my little brother down after a parent's alcoholic fit?
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