
Adults not taught how to manage their emotions, could struggle as parents and fall into a cycle of verbal abuse. What's required is empathy and understanding, for the primary prevention of these unwanted behaviours.
Part of the human condition is that very little is straightforward, and even with the best intentions, family dynamics can become messy and difficult. There's plenty of resources dedicated to how to teach kids emotional intelligence, but it's not always that easy - not everyone has the perception or ability to help build an understanding of their emotions, and effectively navigate their own feelings and those of others.