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
play off one power against another - yǐ yí gōng yí
be ill at ease and full of dread - xīn xù huǎng hū
mountains and seas are whistling - shān hū hǎi xiào
The evil of the party favors the evil - dǎng è yòu jiān