Prince George wasn't the only cute kid hanging out at Prince William's polo match in Tetbury, England, on Sunday. Among Kate Middleton and Prince George's many adorable moments throughout the day were some supersweet interactions with his little cousins. Zara Phillips and her husband, Mike Tindall, brought their little girl, Mia, to the match, and Zara's brother, Peter, was also there with his wife, Autumn, and their two daughters, Savannah and Isla. Prince George was all smiles while playing in the grass with Isla, and at one point, Kate made her way over to Zara to chat and say hi to baby Mia. Keep reading for all the best pictures of Prince George's fun day, then see the cutest snaps of his balcony debut, which looked an awful lot like Prince William's debut in 1984.