It is quite true that there was a strain of Elven blood in the line of Imrahil and Findulis for they descended from Galador twenty-one generations before. Galador was half-Elven; his father being Imrazôr the Númenórean & his mother being the elf Mithrellas. Of course this is only legend that is passed down in the house of Dol Amroth.
I got the above information from the Encyclopedia of Arda website.
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When Elendil fell, Isildur departed to take up the high kingship of his father, and committed the rule of the south in like manner to the son of his brother. He did not relinquish his royalty in Gondor, nor intend that the realm of Elendil should be divided forever.
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