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I will look into this and see what I can find about the intended idea about sons of daughters. I would guess that the son would be the heir rather than the mother (your second daughter).
This time it is the son of my king's brother instead of that brother himself. I'm not explaining because I'm sure we agree that a brother's son doesn't precede that brother (i.e. his father).
It looks fine to me. Maybe you missed that there are two brothers in line of succession where the nephew is the son to the brother who's first in line?