Seven-year-old Sinjin Scozzaro spends summers in Princeton visiting his grandmother, Arlene K. Scozzaro. Before heading home to Austin, Texas, this month, Sinjin wanted to do something to help children less fortunate than himself. So he set up a lemonade stand at the Princeton Farmers Market outside Princeton Public Library this week, raising $213.25 for Christine’s Hope Charity — proving one is never too young to reach out and help others.