Better Idea: Shelter your kids from the truth, and expose it to them gradually as they age. Sheltering them from it is bad, but raising them in a world with no Magic, no Good-Guys-Always-Win, no Santa or anything like that can leave them to be quite different from other kids...
As for me, I was told lies until I found out the truth myself, and as a result, I dislike my parents even more than I would normally.
Good Idea: Not masking your true personality from others because you're they'll reject the true you.
Koda0 (^)