People talked about being a parent, or being a mother or a father. We don't talk about "wiving" our husbands or "friending" our friends, or "childing" our parents. We just talk about being in a relationship with those people. You don't measure whether your marriage was good based on whether or not your husband is better now than he was 10 years ago, or whether your friend is richer than when they first became your friend. The relationships between parents and children is a kind of love, rather than a kind of work.
Caring for children has always been one of the deepest and most satisfying things that a human being does, and yet it is hard to keep a healthy attitude toward it in our competitive, outcome-oriented society.