What do i do if my parent passes away?

Did your parents have assets that require Probate to pass to their heirs?  Probate would begin with filing a Petition with your local clerk of courts to have someone appointed as the personal representative of the estate.  Your parents would have named someone to serve in that role in their Wills.  If they did not have wills, then the state would dictate who could serve, typcially it would be their surviving children who are first in line to serve in that capacity.