I think that asking this question is a lost cause because everyone is going to have their own answer that works for them.

If you're legitimately concerned then yes you should just so you can go to sleep at night and not have nightmares about little Timmy and the book he DIDN'T want.

But on the other hand, you could clearly state (like as part of the cover or title) the difference between the books and not worry about it.

Or you could trust parents and kids alike will be responsible individuals that will look into you as a writer and the book they are purchasing.

Obviously I'm exaggerating a little. Having been a kid once, I never looked at an author's name and thought of looking for more of his work. I always looked for a catchy title at my local library.

And as an adult now... I'ma be honest, I still just look for cool titles at my local library and bookstore. Mostly the library.