Kiddushin 64 - Older Daughters and Younger Daughters
If one has two groups of daughters from two wives, and he says: "I gave my eldest daughter in betrothal to a man, but I do not know if it was the eldest daughter of the older ones, or the eldest of the younger ones, or the youngest of the older ones - they are all prohibited from marrying other men, except for the youngest daughter of the younger ones - says Rabbi Meir.
Rabbi Yosi says they are all permitted to marry other men, except for the eldest of the older ones, for a man would not voluntarily put himself in a position of doubtful outcome.
Art: Daughters of the Earl Waldegrave by Paul Sandby
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