Social Security question..?

My aunt is filing for custody over my brother and I. We both get social security checks for $650 each; for having a deceased parent (my mom). My dad is not mentally well to take care of us, and has been abusing the usage of the checks. My aunt needs financial help, and she was going to to do so with our ss checks. But we cannot get a hold of it, because my dad is the official payee. He left the house, and wont talk to any of us. Can my aunt take the court paper, that states she is filing for custody, and ask the social security worker to change the payee for now. She will get finalized as payee when she becomes our guardian, but this will take about 5 months. So can she get the checks untill then?