No dill in the tzatziki! Spend a Sunday with the Tsipianitis family, and that will be the extent of any culinary deprivation. Once Demetri, Vicky and their sons, Panayioti, 17, and Pavlo, 14, return to their Rockville home from Sts. Constantine & Helen Greek Orthodox Church on 16th Street NW, they get busy in the kitchen. By the time they sit around the table, they’ve all had a hand in preparing a small feast.