妻子

1. Origins, structure, and basic meaning

• Structure: 妻子(さいし) refers to a wife and children collectively.
• Basic usage: It describes moving overseas together with one's wife and children.
  • 彼は仕事のため妻子と共に海外へ移った。

2. Common pitfalls and similar expressions

• A narrower scope than 家族
  • 家族(かぞく) may include parents or siblings. 妻子 is restricted to a wife and children and does not substitute for every family relationship.