Uchi wa san-nin kazoku dakara, konna ni ōkina uchi wa hitsuyō nai desho. (Our family (consists of) three people, so this large a house wouldn't be necessary, right?)
Situation 1: Mr. and Mrs. Shiba are taking a walk in their neighborhood and come upon a large house.
夫： こんな立派なうちに住めるなんて、すごいなあ。