When you have children but you feel childless?

One of the reasons why people get married is to build his or her own family with their children, a happy family that will complete every husband and wife wish list.
But sometimes even do you have children you still feel childless? How this happened?
We become childless even do we have children when we do not feel the presence of our children, meaning you have children but your children’s attention, love and care are far away from you. They see you as a different person, they see you as not their mother or father.
This scenario is painful to the parents where the children treated their parents in a manner that they shouldn’t be treated.
Do you have children like them? Do you feel childless sometimes?