It all depends on which stage they are in life. As young children and preteens kids often begin to discover how they are different from one another as well as begin forming their own opinions. Most kids don't have the patience and understanding to work out differences with each other and are more likely to resort to name calling, fighting and resentment. This was the case with my brother and I; we were total opposites, in both personality and personal interests. This led to confrontations and constant fighting while we were elementary age and young teens. After several years of high school and growing into our late teens and early twenties we formed a friendship and a bond that I could never have predicted ten years prior. It may take a long time for some and it may never occur for others, but siblings who constantly fight, can and often do end up liking each other and can become friends!