3 pounds red potatoes
2 1/2 pounds sweet potatoes
1/4 cup white wine vinegar
1/4 cup olive oil
1 clove garlic, minced
1/4 cup dill pickle relish
1/2 cup chopped red onion
1/3 cup mayonnaise
1 pinch ground black pepper
1/3 cup sour cream
1/2 cup chopped parsley