Holiday Salad

When my mom was a teenager, she decided to make dinner for my grandparents for their anniversary. She found this salad and made it and it has been present at holiday meals ever since.

2 small packages of raspberry jello
3 cups boiling water
1 can jellied cranberry
1 package frozen raspberries
1 cup sour cream

Dissolve jello in water. Add cranberry jelly and raspberries. Mix, then pour half in 9x13 pan. Set. Set the rest to a jelly consistency.  Spread sour cream on firmly set jello. Top with remaining jello mixture and set.