Adam finally asks Mary to marry him. She begins having second thoughts when her parents starting talking about being grandchildren and how hard it was to keep track of Mary when she was little. Mary begins to wonder if she could take care of a child. A blind child gets caught in a dust storm and is found by Mary and Adam. After this, Mary realizes that she has nothing to worry about. They get married by Reverend Alden.

Mary is expecting a child. Mary is able to get Adam closer to his father because of the expectancy of a child. His father even suggests that Mary and Adam come live with him. After Mary has a miscarriage, Mary and Adam really find out that Adam's father only wanted to be with Adam because of the baby. They decide to remain in Walnut Grove.