Personalized Alzheimers Disease Awareness Great Grandpa Purple Youth T-Shirt. Alzheimers disease butterfly lets you show your support for your Great Grandpa with his fight against Alzheimers with this cute purple ribbon awareness I Love My Great Grandpa Youth T-Shirt - Vintage Royal Blue. 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.