Boil berries in water for 20 minutes. Drain and measure juice. Add juice of lemon and grapefruit. There should be 4 1/2 cups of combined juices. Add 1 package of Sure-JellŪ to juices and bring to a boil. Boil for 1 minute and then add sugar. Boil to jell, about 2 minutes at a rolling boil. Pour into prepared sterilized jars, then seal.