i agree. the advice was terrible. prudie made MANY, MANY assumptions about that situation. she assumes the mother is neglectful. why, because she has to work for a living to support her children? she assumes the children are left at home alone while the mother works, even though the letter never says so. and even if they were left home alone, so what? one of them is a teenager. i had many friends whose single mothers couldn't afford a babysitter for their teen children at night, so they were left home alone. it's common, and in NO WAY makes the mother in question neglecful or unfit.
all we really had to go on is that ONE of the children is having issues, and the sister feels that the mother of the children has a drinking problem, which may or may even not be true at all. the advice seeker said they "think" she has a drinking problem, but seemingly, no one has confronted the issue with her or tried to get help for her. if they did, and she relapsed, then why does she have custody of any of the children?
if the advoce-seeker persists in removing one child from the home, she's screwed either way. if her sister is truly a bad parent, the other children will resent the aunt and extended family for rescuing their sibling and leaving them behind, or conversely, it could just actually be that the teenaged daughter is a bad kid through no fault of the mother. in that case, her bad behavior will just rub off on the daughter of the advice-seeker.
sorry, prudie, bad advice on this one.