Actually, Elrond's ethnic makeup is a little more complicated, because he actually has both Elven and human ancestors on both sides of his family (plus a little bit of Maia on one side). Somebody posted that not long ago. I would have to search for the thread but it turns out Elrond is a little more than 1/2 elvish. Celebrian is 100% elvish, so Arwen is slightly more than 75% elvish.
Aragorn is a descendant of Elrond's brother Elros through fifty-some generations (first few Kings of Numenor, Lords of Adunië, Kings of Arnor, and Chieftains of the Northern Dunedain). Exactly what degree of elvish ancestry Aragorn has is difficult to say, probably he is descended from Elros through several branches of his family tree. The Numenoreans, particularly the nobility, were quite isolated from other humans for most of the second age, so it is likely that by the time of the Alkallabeth, some twenty generations after Elros, virtually everyone on the island was Elros' descendent. Likewise, the royal houses of Arnor and Gondor tended to marry among themselves. Recall that the War of Kin-Strife (Third Age ~1400) resulted when one of the gondorian kings married someone not of numenorean descent. So probably Aragorn had a lot more elvish ancestry than one ancestor fifty generations back would suggest. How else would he have lived to 208? My guess is 5-10% elvish ancestry for Aragorn is not unreasonable.
Putting this all together, Eldarion is probably about 40-45% elvish.
One thing we don't know from the books is how long Eldarion lived, one might expect that his life might be even longer than his father's due to his larger degree of elven parentage.
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