Personalized Mimi Valentine Day Grandchild Youth T-Shirt. Mimi's Valentine Youth T-Shirt - White outfit with arrow and heart for a granddaughter or grandson from grandma. 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.