When it comes to stepping up, you invented that stuff, Grandpa. You're always right there at your post, ready for the toughest jobs, whether it's trips to the zoo, picnics in the park, lavish Christmas shopping, or just being an amazing guy with great stories to share. When it comes right down to it, you're the man, Gramps. And here's the tee or hoodie that lets them know, when it comes to love, Grandpas are always on duty.