I need to know what type of forms to fill out in order to become legal guardian of my younger brothers.

I live in NY state and my mother just passed. I have two younger brothers who are still minors and I want to become their guardian. I know that family court is for custody and I have been told that surrogate court is where I need to go in regards to guardianship due to death. When I called my local surrogate court they told me I needed to speak with family court and family court told me the opposite. I just need to know what the proper course of action is and what forms I need to fill out in order to get the ball rolling on this. Thank you.