He's surprised by it, but seemingly to a mild degree only. Like she'd dropped the fact her mother actually was her stepmother or something profound, but otherwise innocuous or common. Dr. Hill's eyebrows go up and he makes an interested "ah!" as he tilts his head to one side.

"Well, that's certain to make family reunions awkward, isn't it? Hahaha." He chuckles softly at his own joke before scribbling down a few more notes. "Do you think that's what preceded your arrival to the Nexus? Death?"