The contest runs until June 30, 2016. For full contest rules and how to enter, visit the Thank You Mom and Dad homepage. "This is more than just a thank you.

Procter & Gamble releases latest 'Thank You, Mom' Olympic Games commercial in correspondence with 100 days until Rio 2016 mark.

If you're stuck on what to write in a card or want to send a longer message via email or text, here’s a simple template you can personalize: Dear Dad, I know I don’t say it enough, but thank you.