This is the 7174th most frequent Japanese word.
一家
"一家" means "a family" or "a household."
In this sentence, '一家' refers to a person's entire family, emphasizing the unit of household engaging in an activity.
彼の一家は毎年夏に山へ旅行に行きます。
His family goes on a trip to the mountains every summer.
Here, '一家' signifies the family unit, focusing on the concept of supporting and maintaining the household.
彼女は一家の大黒柱となっている。
She is the breadwinner of the family.
In this usage, '一家' denotes the collective viewpoint or identity of the family unit.