not be interested in reclaiming his Jewish identity. From a traditional Jewish point of view, he would not be considered Jewish as the link was broken in the second generation in which the father was Jewish and the mother, non-Jewish . Had this not been the case, traditional Judaism might consider him as a Jew in accordance with the view of Solomon ben Simon of Duran(Rashbash, Responsa#89). He was concerned with the offsprings of Marranos and considered them Jewish indefinitely, if the female Jewish lineage remained unbroken. Most authorities would insist on some form of haverut to mark a formal re-entry into the Jewish community(Shulhan Arukh Yoreh Deah 268.10 f Ezekiel Landau , Noda Biyehudah,#150, etc.).
We. however, feel that there must be a strong educational component which will create a positive identity, and so would demand more regardless of matrilineal or patrilineal descent.
As this young man and his forefathers had no Jewish education or contact, we should treat him as a convert to Judaism and welcome him