OK. Let's throw a curve ball into the discussion.
You have the species Onc. A and an Onc. B, and I also have a plant each of Onc. A and an Onc. B. We both cross them, we harvest ripe capsules, and it turns out they are the hybrid Onc. AB-baby.
We each select two superior seedlings from our individual batches, and cross them, giving us each an Onc. AB-baby sibling cross.
If, on the other hand, you have me one of yours, and I crossed it with one of mine, is that still a sibling cross?
One might argue that since all of the seedlings were from A and B they were, but to me, that ignores individuals' genetics.
Let's take it further: what if your species and mine were each the same clone?
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