Minos asked Aegeus if he had a son, as he wished to avenge his son's death, which took place in the region of Aegeus.
The son of Minos was killed in Athens, the region where Aegeus was king. This left Minos very saddened and thirsty for revenge on Athens and the royal family. For that reason, he asks if Aegeus has a son, to have an option which to attack.
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