The scientific studies done over the past few years have indisputable concluded that there are a number of stable and distinct personality types that provide us with great benefits in our day-to-day lives. Knowing what type of person you are will help you adapt to various social situations easily. It will help you gauge relationships on a new level. Yet, one cannot truthfully answer the above questions without a deeper understanding of personality. Personality is much more than physical aspects. Essential characteristics of personalities change, often substantially, when one goes through significant changes in life, whether personal, financial, or accountant-effects. Personality development refers to how people are able to handle new emphatic demands and how they react to crises effectively. Nearly every individual has a pre-natal pattern. This shows that it is important to get to know your child from the start as it can have a profound impact on the personality of your child, but it is also important to get to know others before you make evaluations of their personalities. With this in mind, it is relatively easy to understand that some personalities tend to be much like their parents. Yet personality development during childhood is not as cut and dry as it has been made out to be. Personal characteristics are fluid and changeable throughout a range of environments and experiences. This makes it difficult to generalize much. In some ways, it is more useful to think of yourself and your brother as individuals whose lives are particulary affected by the environment and who have many different influence factors. By abstracting so much from specific environmental or climatic circumstances, it is relatively easy to understand and create subjectivity that is useful in interpersonal skills and decision-making. It is surprising to learn that most of our personalities are influenced by only three factors. These three factors are food, mood and worry. Yes, food and mood are relative factors that have a profound influence on our moods and worry levels. Yes, worry is also relative to the situation itself. The three factors are so important in personality development that they have been placed in separate lists to indicate which of them are most important. We have listed them in order of relative importance. They are not ordered of relative significance or prevalence. This is relative listing for ease of understanding. We could list them in any order if you choose. The most important personality development aspect for you and your brother is probably your mood during times of severe stress. It has been found that almost two-thirds of a person’s personality can be determined by one stressful event. It seems that our ability to be influenced by others and create emotional responses goes beyond mere behavioral differences.