In his book, "The Soul of Black People" (1903), W. E.B. DuBois coined the term "Double-Consciousness", which is

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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

after the roman empire, the catholic church began to unify by taking on many duties of a government.

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom