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RE: Trait Question...
If I understand you correctly:
GrandMother(Twinkle) x GrandFather(Flash) -> Victor (Twinkle hiding Flash or Blush) and also -> Patty (Twinkle hiding Flash or Blush)
Victor x Patty -> "We are Siblings" and also "And our grandfather has Flash"
The odds for each of those siblings are:
1-in-3: Twinkle hiding Twinkle
2-in-3: Twinkle hiding Flash
The net odds of producing a Flash are 1 in 6.
This conditional.
If Flash ever appears, the odds of it re-appearing are 1-in-4.
The difference (5 in 12) .. just shy of 50% .. are the odds that Flash will never appear. (And, gee, I hope I did the arithmetic right: I really should not do this sort of stuff in my head.)
Basically, though, it's a coin toss. Heads you win and the odds are 1-in-4. Tails you lose and the odds are 0.
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