Sister or Brother What's in My Mother Gender Party T-ShirtMachine wash cold with like colors, dry low heat Sister or Brother What's In My Mother Gender Party T Shirt. Great for the new big brother or new big sister to wear to the gender reveal party. If your child is being promoted to big brother, or promoted to big sister, they'll love this funny tee! Designed by No Dice Tees. Be sure to check out the entire selection of No Dice Tees apparel for more designs like this and much more. Lightweight, Classic