Family relationship originally refers to the natural ethical order of brothers, and later refers to family fun.
Generally used as an object, it refers to family happiness. Family fun refers to the fun of family, and should not be used outside the family.
Extended data
The origin of words
Family happiness comes from Li Bai's Preface to the Peach and Plum Garden of the Spring Banquet in Tang Dynasty. The original text is as follows:
The husband of heaven and earth, the inverse of everything; Time flies, and a hundred generations fly by. And floating like a dream, for joy geometry? The ancients walked by candlelight at night, not bad. Kuang Yangchun told me to smoke, and I made a big fake article. It will be a peach blossom garden and a happy family. Qun Ji Jun Xiu, all for Huilian; We sing, and we are ashamed of our happiness.
The translation is as follows:
Heaven and earth are the guest house of all things, and time is a passer-by through the ages. It's like dreaming and waking up are different, and how much joy you can get from changing and entangled! It's good for the ancients to play with candles at night. Besides, spring beckons me with gorgeous scenery. Nature has given me all kinds of beautiful images to gather in the Peach Blossom Garden and tell the happy past between brothers. My younger brothers are handsome and excellent, and they all have Xie Huilian's talent, but I am not as good as Xie Lingyun in writing poems. I am ashamed.
References:
Baidu encyclopedia-family happiness