Joseph, what about hakarat tov, kiddush Hashem and avoiding chillul hashem? In fact, Rav Yaakov Ariel was asked about aveilut by the son of a gentile father and Jewish mother. The father agreed to bring him up as a Jew and even took him to Torah lessons. Rav Ariel ruled that the son should express his sorrow by doing keria and should say Kaddish as his father certainly merited a place in Olam HaBa.
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