I’m looking for cocktails made with grenadine that are sour/tart and have no alcohol taste. No tequila, pineapple, mango or coconut.

Based on your preferences, you're aiming for a cocktail that prominently features grenadine and has a tart or sour profile, while not carrying a strong alcohol taste. Out of the options provided, I would recommend the following two cocktails:

Parson’s Special is a perfect choice for you. This cocktail combines orange juice with a dash of grenadine and egg white. Despite being non-alcoholic, it still delivers a refreshing and tangy flavor thanks to the orange juice, while the grenadine adds a subtle sweetness and a beautiful color. The egg white contributes a silky texture, making it a well-balanced and sophisticated drink.

Another excellent option is the Shirley Temple. This classic mocktail is non-alcoholic and consists of lemon juice, ginger ale, and a splash of grenadine. The combination results in a sweet and tangy flavor profile, with the ginger ale adding fizzy refreshment. It's a drink that's enjoyed by both adults and children and has stood the test of time because of its delightful taste.

Both cocktails are highly rated and lack the strong alcohol taste you're hoping to avoid, while still providing that sour/tart flavor you love. Enjoy sipping on these refreshing options!