Have each family member begin chopping their delegated fruit into 1/4-inch sized bits (banana, apple, grapes, cherries, strawberries–not the lemon or canned fruits). The goal is to make the bits small enough so you get a little bit of every fruit onto the spoon as it makes its way into your mouth.
Pour everything into a very large, preferably plastic bowl and squeeze a little lemon over it periodically as the chopping continues. Please stir following the sprinkle of lemon so it’s evenly dispersed, especially over the bananas.
While all those folks are a-chopping, pour the mandarin oranges and pineapple into a small colander to drain. Once drained, break-up the oranges into mashed/mushed bits and make sure the pineapple is thoroughly crushed. Again, the goal is tiny bits so we can get a bite of everything in one spoon.
Mix everything together, including the sugar.
It’s better if you have one small bowl for everyone following the chopping-event, but the flavor will improve exponentially overnight, too, so you should try it again in the morning. Maybe with some whipped cream…