Philippine passport with English husband

My husband and I are soon to move to China to work at the NAIS School in Shanghai. I have been asked by the school to enquire regarding notarization of documents for my son, who my husband is not the father, who will be coming with us. I am his legal guardian and it is my husband, who will be employed by the school.. If you could advise on the process of notarization I would be very grateful.