WATERTOWN — It was the kind of play Gabriella Coppola  would only attempt with her younger sister Gianna . The junior captain and point guard for the Watertown High Raiders lunged for a loose ball and sent a no-look, one-handed tip-pass to her sophomore sister. Quiet oohs came from the impressed home crowd in the bleachers.

“I was like ‘Gianna’s gonna get this,’ ’’ said Gabriella, older by 18 months. “She always catches my passes. We’ve grown up playing together forever. I can gun it at her and she’ll always catch it.”