See my long disquisition of the probable genetics of pointy ears above.
It boils down to is first generation half-elven are sure to have pointy-ears, (certainly Elrond and his children do). Second generation with one full mortal parent have a fifty-fifty chance of inheriting the pointy ears, ditto for the offspring of any of those who hit the jackpot.
Thus several generations of Elros' descendants might have possessed elven ears. And the same goes for the House of Telcontar.
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