Redtail Rise Whiskey tango foxtrot

She didn't seem to mind the question, which made him relax at least a tidge. He had been hovering on the suspicion she might take a snap at his nose just for daring to greet her. Her presence was intimidating.

What is 'sivulluk'? Is it family? The unfamiliar term rolled off of his tongue easily, the syllables a mimicry of her pronunciation, but he had few guesses on the meaning. It hinted that wherever she'd come from was completely foreign to both he and Redtail Rise. Did she leave because the sivulluk left? Who were they?