In the book Falling Leaves by Adeline Yen Mah, the title of chapter 1, "The Appropriate Door Fits the Frame of the Correct House," is a translation of the Mandarin idiom "Men Dang Hu Dui." It loosely means that a well-matched family, socially and financially, will be successful, if not also luckier than those who are not well-matched.
The use of the phrase is used to suggest the content of the chapter, which focuses on the origins of Adeline Yen Mah's affluent family. The chapter begins with a history of Shanghai in the late nineteenth century and the wealth pouring into the city as a result of the seaports and trade. "Opportunities were limitless," she explains. This becomes the backdrop and the starting point for the author's tracing of her family's roots. Very early on, her great-grandfather opens a teahouse, which is very prosperous.
The chapter eventually leads to Adeline Yen Mah's grandparents and their marriage. As she explains, "My grandparents grew to love each other and had seven children in quick succession," one of whom was her father, born in 1905. Her grandfather, Ye Ye, supports his family through leasing "a small fleet of sampans," or “bum-boats." The author describes Ye Ye as a responsible man who didn't gamble or waste his money on "brothels or opium."
Although Ye Ye eventually sells his business and "moves north, leaving his family behind," he continues to support them financially. All of this ties back to the title: the fact that Adeline Yen Mah's family had financial and social standing and support allowed for a successful and "lucky" marriage with children and further abundance that was shared with the family, including the author.