Continuity mistake: In the pilot Artie and Charmaine Bucco had two kids, Art and Melissa. But in this episode they refer to their daughter as Kiara and their son is never mentioned again.
Suggested correction: Nope. You should rewatch. Artie and Charmaine have 3 kids; Chiara is the eldest, and their two younger kids are Art and Melissa. In S1xE13 "I Dream of Jeannie Cusamano," Tony, Carmela, Meadow, and AJ wind up at Nuovo Vesuvio during the thunderstorm. Then Charmaine tells Meadow and AJ, "Chiara and her brother and sister are back in the kitchen." In S4xE6 "Everybody Hurts," Charmaine tells Artie, "We'll start working on your empire right after we pay the 10,000 dollars of orthodonture Melissa's gonna need this year."