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No, it doesn't work like that. Mortality is the default setting for human/ elf crossbreeds because Death is the Gift of Eru to men and may not be withheld. Tuor is a bit of an exception here but as a chosen tool of the Valar I suppose different rules apply. Mithrellas' children were mortal and presumably that was why she left because she could not bear to see her family age and die. It is a bit tricksy since Dior and Nimloth aren't properly accounted for, but the freedom of choice is a special grace granted to Earendil as a pawn of the Valar and extended to his sons.
Imrahil's family is longlived because they are pure Numenorean rather than part elvish. They are nevertheless ennobled by the elf influence.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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