"Zaidie" is the Yiddish word for grandfather. But, there are grandfathers and there are zaidies - they're two different concepts.
My zaidie, Gamliel "Leo" Brody, came to the USA right before Hitler invaded Poland. He never did learn English properly, but that didn't stop him from opening a little grocery store a few blocks away from the Capital Building in Washington, DC. He had a smile for everyone, and everyone loved him, especially his grandchildren.
Zaidie was a little guy, only 5'4". He was in the Polish Cavalry in World War I, and he could do all kinds of acrobatics on a bike. He was adept with bicycles because in the good days, before WWI, his family owned a bicycle factory. He'd do anything to make us smile, especially when we were down. After he suffered his first heart attack (he died from the second one, a year later), he saw that I was a bit jealous, because my next younger brother received a gorgeous new bike. He took the bike, went up to the top of the block, put it in motion, stood up on the bike seat, and road down Easecrest Drive in Silver Spring, standing on the seat with outspread arms like an eagle. People from all around ran outdoors to see the spectacle. We were yelling with glee, "Zaideeee, Zaideeee!" My grandmother heard the commotion and came running outside, frantically yelling in Yiddish, "Gamliel, vos teets du, dein hartz, dein hartz!", Gamliel, what are you doing, your heart, your heart! He didn't care - everybody was smiling and having a great time.
Our parents knew that they couldn't scold us in front of Zaidie. He was the best defense attorney in the world, for he only saw the good in people. Zaidie wasn't "religious" by the book, but he was the warmest human being you'd ever want to meet. Because of him, I wanted to be deeply Jewish. Because of him, I wanted to see the good in every human. Because of him, I wanted to be a "zaidie" too and not just a grandfather. I don't think anyone on earth has ever had such a profound and lasting effect on my life. He always told me as a child that my future was in Israel. He left this world when I was only 14.
I miss you, Zaidie.
My Zaidie's yahrtzeit is today, the 6th day of Av.