Will my green card petition be considered invalid?

My mom was married to an American citizen in 2005 and became a permanent GC holder back in 2006 (they have one child together). She was naturalized in Sept 2010. In Dec 2010, after a family dispute, and minor physical assault, my stepdad Divorced my mom. My father sponsored, petitioned, and filed an affidavit of support for my green card (I got 10-years-GC back in 2007). He asked for my GC number A# recently, I scared he wanted to contact USCIS saying that we got it through fraud because he is really furious at us at the moment. My question was, can he do that? He doesn't have any proofs whatsoever for his claim since it was a legit non-working marriage (one children). Will USCIS revoke my green card? (I'm 15 months away from naturalization). Thank you sir/madam for your kind answers.