These are matching mother and child t-shirts made by the Arton Collection Project.  Arton is an environmentally friendly t-shirt company that collects and prints children's art to raise money for arts programs and scholarships.  Arton prints on 100% organic cotton, using water-based inks.  The artwork is drawn by Mark, a 10-year-old boy, and both his name and age are on the t-shirt as well.

http://www.etsy.com/shop/artoncollection