Elrond and Elros are descended from Beor through Rian mother of Tuor.
They are descended from Marach through Huor's father Galdor (Huor was the father of Tuor).
They are decended from Halmir of the Haladin through Huor's mother Hareth.
This covers the Three Houses of the Edain.
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Tar-Elenion
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