3 reasons to tell the truth

1. It builds character.  Candor takes courage, but each of us is better in the long run when we speak and hear the truth.
2. It simplifies life.  It may be hard in the moment, but it ultimately makes life more simple for everyone.
3. Honesty is contagious.  It sets a good example, not just for your kids (which is important enough), but for everyone around you.  While the truth will cause some people to distance themselves from you, generally people are relieved by truth and transparency.