In this book, the authors shed some light on the concept of family, family relations, marriage and marital and family compatibility. They also shed light on the most important issues that threaten the family entity in order to identify the causes leading to them in an attempt to show these causes and reach some methods of treatment and avoid these causes in light of the modern changes in society, in an attempt to contribute to a positive role in understanding family relations and knowing the foundations of their cohesion and compatibility in order to achieve happiness for the family and society.