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From what I've read the Farsis allow all marriages except mother-son. Sister-brother, father-daughter, aunt-nephew, etc. They were so out of bounds, historically, that they were thrown out of Persia/Iran and migrated to India where, as I learned, almost anything goes when it comes to worship.
That doesn't seem logical to me.
We SAW the Farsis and the areas where they lived when we went to India. You can SEE the Farsis because of their inbreeding. It's not some dark, well-kept secret.

You can see in the inbreeding of the royal family in Saudi Arabia too, but they marry no closer than first cousins. MANY physical problems, especially heart and eye problems.

The TWO best heart clinics on earth are in Riyah, the king's home AND on his personal 747. But, then, they do have enough money for that, don't they?

Zurvanism is now extinct. That HAD to have happened for a reason.

From Wikipedia:

Zurvanism [pronunciation?] is a now-extinct branch of Zoroastrianism that had the divinity Zurvan [pronunciation?] as its First Principle (primordial creator deity). Zurvanism is also known as Zurvanite Zoroastrianism.

In Zurvanism, Zurvan is the god of infinite time (and space) and is aka (“one", "alone”) deity of matter. Zurvan is the parent of the two opposites representing the good god Ahura Mazda and the evil Angra Mainyu. Zurvan is regarded as a neutral god, being without gender (neuter), without passion, and one for whom there is no distinction between good or evil. Zurvan is also the god of destiny, light and darkness. Zurvan is a normalized rendition of the word, which in Middle Persian appears as either Zurvān, Zruvān or Zarvān. The Middle Persian name derives from Avestan zruvan-, "time" or "old age".

Zurvanites considered Ahura Mazda and Spenta Mainyu one of two equal-but-separate divinities under the primacy of Zurvan. The central Zurvanite belief made Ahura Mazda the middle god and Angra Mainyu the fallen twin brother. Mazdeans consider the divinity of Ahura Mazda the transcendental creator.

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It's moot now since Persia/Iran is Muslim.

BTW, it doesn't seem any more or less logical than any other faith. My opinion!

P.S. Do you think that the Japanese got the name for their car "MAZDA" from this Indian deity? Ya never know. :o)