Sour Cream – Orange Jell-O Salad

1 (3 oz.) pkg. orange Jell-O
1/3 c. sugar
1 c. boiling water
1 can Mandarin oranges, cut in half and drained
1 small can crushed pineapple, drained
1 small carton sour cream

Add boiling water to Jell-O and water. Add fruit and sour cream last. Chill.