It makes sense. She's seen soldiers often share a tribal-like relationship among each other... not that Rey ever got to experience that much herself, oftentimes being an outsider by design.

"Well, had a person." She huffs at her own admission, scratching the side of her neck before she adds: "A brother. Never did have what he did, though."

Orion was able to accept familial figures his entire life -- if only because he actually had one, unlike Rey.