Personalized Big Bro Announcement Thanksgiving Brother Youth T-Shirt. I'm thankful because I'm going to be a big bro Youth T-Shirt - White new baby announcement for Thanksgiving family dinner gatherings. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.