I'm The Oldest Child I Make The Rules Siblings Shirts Rules Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat I'm the oldest I make the rules t-shirt. This funny shirt for siblings come in 3 variant : I'm the oldest, I'm the middle, and I'm the youngest. Lightweight, Classic fit, Double-needle sleeve and bottom hem