intervention makes a difference. hopefully the boys learn that it is not OK to abuse, & the daughter learns that she does not have to be a victim.
In this story the daughter has good role models (both mother & grandmother) which is an important protective factor. If she ever decides to get married, she will know that abuse is unacceptable & she will know how to get help if her husband is abusive.
what about the boys? they saw their father get away with abusive behavior for many years until their mother demanded change. so will they end up thinking that abuse is OK as long as the wife tolerates it? Or will they learn that it’s never OK to treat your wife badly?