A.T. Robertson Commentary Luke 7:31

"Whereunto then shall I liken the men of this generation, and to what are they like?" — Luke 7:31 (ASV)

And to what are they like? (κα τιν εισιν ομοιοι; ). This second question is not in Mt 11:16. It sharpens the point. The case of τιν is associative instrumental after ομοιο. See discussion of details in Matthew.