How did Aegeon's family come together and get separated in a matter of days?

When Aegeon was young and in Epidamnum on business, he sent for his wife, who gave birth to identical twin boys soon after arriving. In the same inn, a poor woman also gave birth to identical twin boys. Aegeon bought the boys as slaves to his sons. On their voyage home there was a terrible storm and the ship was torn in two. Aegeon saw his wife with one son and slave being taken up by fishermen. He and other two boys were saved and brought to Syracuse.