Picture this. A family in an ice cream shop. The adults are sitting together talking while the kids are eating ice cream and playing together. Slowly but surely the kids begin to get a little louder, a little rowdier. Maybe people in the store begin to glance at the scene the kids are making. The mom stands up, puts her hands on her hips, gives them the look, and shakes her head. The kids immediately stop and sit up then finish their ice cream while the adults go back to talking. Every family has their own unspoken and spoken rules, whether its to 'Behave in public', 'What mom says goes', 'Sister gets to ask for more ice cream, but I don't', or 'Don't run into the street'. These "rules characterize, regulate, and help stabilize how - and how well families function as a unit"1.
Rules are created from the very beginning of the relationship and once there, they are usually there to stay. Some rules are very helpful, such as 'Don't run into the street'. Others are not. Rules like 'Every time mom approaches dad about money they start to yell'. Or 'When sister starts a temper tantrum she always gets her way'. Rules, good or bad, are what make a family unique and different from other families. Rules do multiple things. One is to help the family members learn what they should do and how they are expected to act. They also indicate where the boundaries are. Boundaries separate the family from its environment and other families. Some families have healthy boundaries while others either have no boundaries or are have boundaries that are too closed.2
How could you go about changing unhealthy boundaries or rules? The first step would be awareness and acceptance. It can be hard to accept that one might have an unhealthy rule or boundary. This is their family. The rules and boundaries are a part of what makes them different from other families. The rules and boundaries are usually based on values. One way to assess if there are unhealthy boundaries or rules is to look to the family and see if any individuals display any symptoms or problems. I like to view the family as a circle. When sister acts a certain way it is going to cause brother to act a certain way, but because brother is going to act a certain way, then sister will act a certain way, etc etc. Which means if there are any unhealthy boundaries it is highly likely that one of the family members is going to act a certain way because of it. This isn't to put blame on anyone or say no one is responsible, but rather to focus on the problem instead of the blame. If you still can't decide if there is a problem or are worried about it you can always talk to a professional. I am not a professional, therefore I would get the opinion of one before making any conclusions. Optimally the best route would be to change the rule or boundary to fix the problem.
There are many different theories that professionals use to explain what is happening and that they use to help families. The one that I am partial to is Family Systems Theory, which is what my post is based off of. One of the main parts of Family Systems Theory is that "The whole is greater than the sum of the parts.2" Meaning that the family is like a cake. You can have all the ingredients together, but that wouldn't make a cake. The members in the family are the ingredients and when they come together in a family that makes it into a cake.2
In the end if you believe there is a problem I suggest talking to a professional therapist. They might have different theories that they will change how different therapists help you or your family, but that is their objective and their job, to help.
1-The Family as a Psychosocial System.
2-Reproduced from Ingoldsby, B. B., Smith, S. R., & Miller, J. E. (2004). Exploring Family Theories. In Family Systems Theory (2nd Ed., Ch. 5, pp. 123 -139). New York, NY: Oxford University Press