The Sound of Children

S5 E18: Adam and Mary are expecting their first child. Mary, who knows that Adam has a strained relationship with his father, secretly writes a letter to the man. Thomas Kendall arrives in Walnut Grove for a visit and desires to be closer to his son and grandchild. Meanwhile, Albert Ingalls is smitten with Miss Bennett, a beautiful young woman who is substituting for Mrs. Garvey at school.