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Famous Twins had a significant role in the history of Arda. It is mainly noticed among Elves and Half-elves, but some have been recorded among Men. It is interesting to note that many of these twins are ancestors of, or siblings are ancestors of, Elladan and Elrohir, who were themselves twins.
Elven and Half-elven Twins
As has been said before, twins seem to be common among Elves unlike the Mannish standard of one in sixty. Elven twins:
Twins run through the female's genes. That means if the father had ancestors that were twins, but the female does not, the chances of having twins is very slim. However, if their daughter has children her father's genes affect her chance of having twins.