Answer: This is because the family system theory has to do with how the members interact with each other to influence each other's behavior. If someone was in a bad situation and had a good relationship with his family, he would most likely look to his family for help or at least inform them but if he had a bad relationship with his family he would either ask friends or try to solve the problem himself. That's how family system theory can affect what someone does in a given situation.
The family system theory can explain why because we cannot grow in isolation but rather we grow as family, this is what the family system theory suggests. As a family we learn from them because we are around them most, this includes our emotions. That is how the family system theory can explain why family members/ourselves behave the way we do.
