Make your next visit to the grandkids even more special when they learn to play mah jongg. 6, 1 hour sessions-pay 1/2 price for your grandchild. Up to two grandchildren can work together on one computer for the price of one. Max 4 grandchildren per session. Special pricing for more than 2 grandchildren will apply. If you live in the same area as your grandchildren sit side-by-side and assist them as they learn.