Aragorn and Arwen relatives?

I heard an opinion Aragorn and Arwen's relationship was incest and according to strict principles of Elves that two never could be a couple because Elessar was great-great-great grandson of Elros and Arwen was Elrond's daughter. Elros and Elrond were twin brothers.

I wouldn't call their relationship incest. What say you?
 
it wouldn't count. and according to something else I read (I don't know if it was accurate or not, please correct me if I'm wrong) Elrond and his wife were actually much more closely related than Aragorn and Arwen.
 
There were about 23 generations between Elros and Elendil and about another 40 generations between Elendil and Aragorn. If each generation reduces by half their shared genes (i.e. 1/2, 1/4, 1/8, 1/16, and 1/32 after five generations) by the 63rd generation it would be infinitesimal; approx = (1/2)^63. My math may be a little rusty but you get the picture....
 
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