Refrigerate graham cracker crust until well chilled.
In a small bowl, combine lime juice, lemon juice, and unflavored gelatin; let stand 4 to 5 minutes or until softened.
In a large bowl or the food processor, combine gelatin mixture, mashed avocados, and sweetened condensed milk. Pour mixture into prepared graham cracker pie crust.
Refrigerate at least 2 hours or until the filling is firm.
In a small bowl, whip heavy cream and sour cream together until stiff peaks form. Serve pie topped with prepared whipped cream mixture.
Makes 8 servings.
Avocado Pie Recipe: https://whatscookingamerica.net/fruit/avocadopie.htm