Children are supposed to help hold a marriage together. They do this in a number of ways. For instance they demand so much attention that a husband and wife concentrating on their children fail to notice each other's faults.
I speak about family and adoption because it 100% changed my life and who I am. It definitely played a very large role into just learning how to be grateful for what you have and being fulfilled in a way that a lot of adopted kids don't feel.
