Avocado Watermelon Lime Parfaits

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Ritchie Estate in Balch Springs, Texas in 1984.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * ¼ small watermelon
 * 1 pint lime sherbet
 * 1 large avocado peeled and sliced
 * 12 ounces bottle 7-Up

Directions

 * 1) Make melon balls of watermelon.
 * 2) Alternate small scoops of lime sherbet, melon balls and avocado slices in chilled parfait glasses then pour 7-Up over mixture immediately before serving.