My dad and I are very different in some ways but we still have a good relationship. And I still learned from him. He taught me to care about others, give a helping hand to others and family is the most important thing in life. He was far from a perfect Dad but he is still my Dad.
Happy Father's Day to all you fellow Fathers and Grandfathers. Hope you all get to spend time with your loved ones today. Like Tag said, it's not about the cards and gifts. It is about the memories and time spent with your kids, Fathers, and Grandfathers/kids.