Ubbe tilts his head in thought and makes a quiet sound that's an indication that he'd heard and understood but he didn't have anything to add. That's the thing about him, he won't say anything if it doesn't need to be said most of the time. Back home, most people were rather good at reading his body language and the like which he used instead of words quite often.

"She is my sister," he said, half sister to be fair, older but dead before he was born.