The family format has changed over the years. We now have a vast assortment of different types/groups of families to suit every lifestyle and level of comfort. Today's family could range anywhere from a couple (man and woman, two men or two women) to a couple and one or more children. Since everyone has a different definition of family, no one combination is right or wrong.
The "childless couple" families of recent times just don't feel the need to become parents due to their own reasoning. Some feel as though their lives are already perfect without the addition of an offspring. They would prefer to devote their time and energy to other things besides raising children. Sometimes, you do find couples that are willing to contribute to the population but unable due to several reasons such as health problems or financial problems. I believe that every couple should experience being a "childless couple" prior to bringing a child into a relationship that does not have a strong foundation.
In "mother-only" families, women take the primary responsibility to raise and care for children without the support of a man or other parental figure. Some of the mothers take full responsibility for their children, including financial, emotional and physical support. There are several mothers who choose to raise their children alone because they may be lesbians and not have any romantic involvement with a man or they may not be capable of carrying on a civilized and rational relationship any longer with the child's father. You also find those who feel as though their biological clocks are ticking just want to reproduce with or without a spouse. Goldscheider and Waite noticed that in "mother-only" families "sons don't actually lack the models of ideal
men, because these models are amply provided by other male relatives, friends or the media". Goldschneider
...