i don't get the correlation between the suggestion that living with an active alcoholic AND a baby is a bad situation and that doing something about it means eviction.
as it is, your teenager got out the minute she could. that roof over her head and food in the fridge were not enough for her to tolerate another day with a dangerous drunk mom and a dad who won't take action.
it's sad, she felt she HAD to protect her little brother. that was never her job or her role. now a defenseless 3 year old has no protection. the drunk driving is so scary.....for her, for anyone in the car with her, for anyone she randomly plows into, injures or kills.
i appreciate you showed a spark of anger here......perhaps you can harness that towards your home situation.