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I've always presumed that Macross never payed much attention to elementary genetics.
My only explanation is that Zentraedi have 2 y chromosomes, and that Meltlandi eggs only accept x chromosomal Sperm. Which would make Zentraedi and Meltlandi incompatible, This effect would probably dissapear by the second generation, particularly with Zentraedi, Zentraedi offspring would have 1 x and y, making them normal humans gender wise. Meltrandi might have a defective gene or something, so their daughters would have a half chance of carrying it.
So it would be possible for Ranka to have a Zentraedi grandfather.
That said, all this does fly in the face of conventional biology (could someone survive with 2 y chromosomes?) though this is a series with "song energy" so perhaps it's not THAT out there
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