relatives by marriage
The Chinese idiom, Pinyin is é RN ǚ Q ì ngji ā, which means that two children are married. It's from Hua Yue Chen.
The origin of Idioms
Chapter 52 of Hua Yue Chen: "after several years, he started to make money and married a relative. He became a son and daughter with baldness."
Idiom usage
To be formal; to be an object; to refer to the relationship between relatives. No matter who the insurance company is, you can help him if you and he are in family. The second act of Hong Shen's Fragrant Rice
relatives by marriage
life is intermingled with joy and sorrow - lí hé bēi huān
Opportunity is not lost, it will never come again - jī bù kě shī,shī bù zài lái