Why are there so many sets of twins and triplets in the novels?
There is actually very little information about the people and society of Atlantis. After conducting an investigation for five years, in 1991, I wrote a fifty page paper called Society in Atlantis which encompassed research from the many sources I read.
Most notably, the first set of triplets appears in the first book at the Educatory. We are introduced to Yapet and Seskef and a third triplet whom is never seen. The biblical account of the floor in Genesis 5:32 and Genesis 6:10 clearly state that Noah had three sons at age five-hundred. Assuming this is true and they all had the same mother, then they would have been triplets. I drew from this story for motivation for the characters of Yapet and Seskef.
In Atlantis: Fall of the Gods you will notice that Etruscan Evaemon is stated to be the twin brother of Etruscan Mnesus. As a matter of fact, though not clearly stated, all ten Etruscans are pairs of twins. The motivation for this comes from Plato’s account, where he tells about Atlantis having ten kings, of whom were all five sets of twins.
Many times one would think the story might have a classic twist where one twin pretends to be the other. So far, the story has avoided this situation and does not state if any of the triplets or twins are identical. From the descriptions and characterizations most readers would assume them not to be identical … but just remember, the last book hasn’t been written yet.