Private Adoption in the Philippines

Sir, i have adopted my nephew in the Philippines. When the petition was filed i was still LPR then last May 3, 2013 i got my citizenship thru the army. The decree of finality was granted October 31, 2013. My nephew is here now on B2 visa and would like to petition him on the basis of he is a special child and i am in the army reserves. the last lawyer i talked to said i fall in the Hague convention. Do you think this is the case? or i can still do immediate relative petition? Would appreciate your reply.