Personalized Rockin' Grandma White Text Youth Long Sleeve T-Shirt. Rockin' Grandma Text with a happy dancing rock is a funny Youth Long Sleeve T-Shirt - White for grandmothers on Mothers Day and Grandparents Day. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)