Roestraten was not only a student ( the Haarlem archives contain a notarised document , which supports this fact ) .
He also became a son - in - law of Hals when he married his daughter Adriaentje .
Roestraten was not only a student ( the Haarlem archives contain a notarised document , which supports this fact ) , but he also became a son - in - law of Hals when he married his daughter Adriaentje .