Parents' love is critical, because without it, children will not care for themselves. And they must care for themselves before they can care for anyone else. The support that family members give each other, in fact, helps make a family strong. Parents and children learn to sense that they can count on one another. The sense of caring, however, must grow as the parents' lives change.
Goodness is a moving target.
As children grow up, they can help deal productively with the daily strife and long-term challenges that are part of life. Obviously, parents need to take the lead in showing children how to deal with problems. Necessary ingredients include commitment, time, and a lot of talk. Learning to care also requires thought. Parents can read about techniques to help them take this lead, and public libraries have a variety of books on the topic.