They taught us and helped us grow. After we had developed as much as we could in Heaven, we came down to earth to receive physical bodies and continue our development. We come down into earthly families, patterned after our heavenly family. After we develop a little bit and become adults, our responsibility is to marry and invite spirit children into our home so other spirit children of our Heavenly Father can come down and continue their development. When we become parents, we not only help another spirit progress, but we progress as well, since we learn how to act more like our Heavenly Parents as we nurture and teach our children.
Families are the training ground for eternity.
Since the Celestial Kingdom is structured into family units, we need to know how to act celestially as both children and parents to live there. In our earthly families, we can practice all of the virtues we need to live in the Celestial Kingdom. Home can and should be a Heaven on earth. Our new baby Sarah is just starting her earthly experience and we are given a special stewardship as her parents. She comes to our family with her own set of characteristics, talents, strengths and weaknesses that were hers in the preexistence.