Why are Jiangxi people called "old cousins"?

The name "Old Table" was spontaneously initiated by Hakka people in Jiangxi to adapt to the unfamiliar living environment. Since the Qin and Han Dynasties, the Han people in the Central Plains have been relegated, stationed, or looking for new living space, and moved south. Most of them settled in the mountainous areas of Fujian, Guangdong and Jiangxi, which are heavily blocked by Guanshan. The aborigines call themselves "sitting tigers", while the Hakkas (that is, the Han people in the Central Plains) are called "mountain tigers". The natives fight for the mountains, and the two tigers are fierce. Hakkas of different nationalities, surnames and clans cleverly use the name "cousin" to strengthen their feelings with other Hakkas, so as to achieve the goal of uniting hand in hand, sharing weal and woe. Over time, "old cousin" has become a common practice and has become a kind name for Hakka people in Jiangxi to enhance friendship and establish new interpersonal relationships.