The Cardullo family is parting ways with their longstanding business, Cardullo’s Gourmet Shoppe, a landmark in the heart of Harvard Square for the past six decades. Sisters Donez Cardullo Tavilla and Francesca Cardullo Sibboe have sold the popular business to Newton couple, Rich and Kim Wilson. The sale will be finalized in four to six weeks once the liquor license is transferred, but the new owners plan to keep the shop’s name and mission, according to Tavilla.