Luisa and Enzo Villafranco had a busy day earlier this month as the siblings – ages 6 and 3, respectively – staffed their annual lemonade stand near their family’s home on East Nevada Avenue in Haven Beach. As parents Bill and Cortney explained, this is the third summer the children have sold their $1 refreshments for charity; this year, all proceeds benefited Waves of Strength.

As the sign hanging from the youngsters’ lemonade stand read, Waves of Strength is “a 501(c) nonprofit organization…