In the Elvin world, Multiple Births are considered rare. When they do happen, they are frowned upon. This is because elves believe that the more children you have (not just in the case of multiple births), the more diluted the talent is. However, this may just be a ruse to prevent elves from being overpopulated because their lives are indefinite. There are a few people who don't believe this, such as Sophie and her friends, Juline and Kesler Dizznee, etc. Here are the most famous multiple births in the series.
Probably the most famous of the multiple births in the whole KotLC franchise is the pair of Tam and Linh Song. Because they're fraternal twins, Tam and Linh could've passed off as separate siblings but weren't. Tam and Linh's parents, Mai and Quan Song, sent Linh to Exillium after she nearly flooded Atlantis. Mai and Quan were against multiple births and hated having twins, as they felt it brought disgrace upon their name. Linh accidentally flooded Atlantis, but this was her parents' fault because they shouldn't have taken a new Hydrokinetic to Atlantis. Tam refused to let Linh go to Exillium by herself, and went with her. They lived in the wild for a while together. Tam and Linh were unsure of their ages (they are both 15) because their parents kept trying to pretend they were a year apart. In the books Flashback and Nightfall, Mai Song, Tam and Linh's mother, seem to be wanting the twins back in their household.
These three children are the triplet younger siblings of Dex Dizznee. Rex and Lex are boys, and Bex is a girl. The reason they all rhyme is because Dex's dad has a bad sense of humor, as said by Dex himself. Their parents, Juline and Kesler Dizznee, are okay with multiple births and don't hide the fact that they are triplets.
The triplets are the reason Juline joined the Black Swan because she knew the Black Swan would help make multiple births more acceptable. The triplets are also rambunctious and continuously break things. It was mentioned that because of prejudices, it is hard to find babysitters for the triplets.
The Mr. Forkles Edit
In the biggest plot twist of the KotLC franchise, it is revealed that there is not one, but TWO Mr. Forkles. At the end of Lodestar, one of them dies, causing everyone to believe he was dead. It is revealed in Book 6: Nightfall that when they were young, their parents would hide one away and send the other into the world. When the one who went out into the world came back, they would rehash their day to the other. They lived their whole lives as one person and continued it that way when they grew up. When they were young, they thought everybody had a secret twin. It was only when they got older did they realize that their parents were lying. They decided to keep it going after they found out though because it could be useful in the future. Also, if they let anybody know they were twins, they could never take it back (and would probably be looked down upon as twins and triplets generally are). If they had been fraternal twins, their mother and father would've hidden one and faked the second pregnancy, but since they were identical, they resorted to hiding one twin.