Personalized Big Brother T-Rex Youth T-Shirt. I'm the big brother. A T-Rex dinosaur puts his arm around his little sibling who is fresh out of the egg. Cute gift for a big guy! 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.