Children learn what they are taught.
Children of dysfunctional homes enter adulthood coping with life in the same ways that proved valuable to them as children. They take their childhood roles, survival strategies and rules with them into adulthood. Later, they discover that what worked in a dysfunctional childhood home does not serve them well in adult life. But there is a curious thing about human beings. We tend to do the same things over and over again even when our behavior no longer pays off.