Regarding the woman who said that the reason for her children being beautiful and her sons all being talmidei chachomim was that the walls of her house never saw her hair:
THAT is not halacha l’maiseh. It is a really nice story (even possibly true), but it is just a story. It is also HER OWN OPINION as to why she was thus blessed. I know some very amazing Yeshivah bochurim, whose mothers never even went to the mikvah, much less covered their hair. They too have attractive siblings, and all the kids became frum within a short period of time from each other, though the parents did not go down the same road.
There is a “danger” inherent in these nice stories, in that some people start to accord chashivus to them as if it were Torah m’Sinai, and it is not. The idea is to take from the story that which is important, namely, that it is a good thing to be makpid in the mitzvos that we do, because when we are, we are able to provide a good environment in which our children may grow up.