S07E13: Come, Let Us Reason Together

Percival's parents decide to pay a visit. Mrs. Oleson and Mr. Percival don't hit it off so well. Mrs. Oleson is strongly against Mr. Percival's idea of raising Nellie's child as a Jew. An agreement is finally reached between the two. A girl would be Christian and a boy would be Jewish. Nellie ends up having twins, a boy and a girl.