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Yes, that's it! More than 2!

@starscream97 had a decent response if he argued it. I'll argue it for him.

Heteropaternal superfecundation is technically twins since born together but are only half-siblings and not "true twins" as they share only the same DNA as the mother.

Scienced!

But seriously, it is possible?

Not sure if for humans, definitely for some species of animals though. I've not googled it for humans.

Sounds like a research grant proposal!

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