The son of the idolater Terach - owner of popular idol supermarket in Charan - became the father of the Jewish people and father of world monotheism.
The daughter of that deceiving cheat Lavan, Rochel and Leah, became the mothers of the Jewish people.
To skip a few thousand years:
The grandson of Leon Trotsky is a religious Jew, living in Eretz Yisrael.
The daughter of the President of the United States, a goy ben goy of German descent, is a religious Jew, raising a shomer shabbos family and living in Washington where her husband attends a Chasidic [Chabad] shul!
The daughter of Prime Minister Netanyahu is a Charedi women, raising little children with peyos and long skirts [כן ירבו].
One of the most outspoken critics on the web of Charedim and proponents of college education, working for a living and all of the MO issues, has a son who is Rosh Chaburah in the Mir Yeshiva, the flagship institution of NOT going to college or working [he says that he is very proud of him - as he should be].
My favorite [li-havdil]: The grandchildren of Haman learned Torah in Bnei Brak [as Chazal tell us].
The moral - Never give up. Regardless of the chinuch one receives he or she can become great.
[Of course there is also a list of great people who had children who went in the opposite direction...]