What is the contextualization of southernization?

Southernization was well under way in Southern Asia by the 5th century, C.E., during the reign of India's Gupta kings [320-535 C.E.]. It was by that time already spreading to China. In the 8th century, various elements characteristic of southernization began spreading through the lands of the Muslim caliphates

the three roles stated in the dialogue develop the siblings' personalities.

lloyd's personality looks like a trademarketer

dana's personality is afraid from lloyd's behavior and the oldest sister is a decided person who tries to solve any conflict