The techniques that are used to raise children are often handed down through generations without much modification. The principles laid down by great grandparents and their attitude to discipline tend to be evident in the child rearing practices of the present generation.
This is compounded by the fact that two separate family trees have contended on a daily basis through these generations about the principles and techniques to be used. Even minor differences in approach might produce conflict because parents are passionate about what is best for their children.