In adjusting to all the people from his universe here, Luke was having a harder time adjusting to those from his future. Beru didn't take much adjustment to, she had raised him and even though she was far younger than when he'd last seen her, she was still the same woman she always was. There was something familiar about her, whereas with Leia's children and grandchild, he had no real feeling of familiarity with them, though he was starting to develop a good relationship with Anakin. But Siri was someone he didn't know from his past. He was a little uneasy, if only because she was from the time when his father had been training to be a Jedi Knight.
Luke sat on his couch, wondering just what Siri had to say, and what she knew of his father. Perhaps she could provide some answers to his questions. The topic of his father was a little touchy with him, especially considering he was trying to reconcile the picture he'd had of the man growing up. Luke had always seen his father as a noble Jedi Knight, one that was killed by Darth Vader. And now Vader was his father? Well, perhaps in a way Vader killing his father was true, but Luke was wanting to know how Vader went from being a good man, as Beru had remembered him, to being the monster he and Leia had fought against.
When the knock came to his door, Luke got up and walked over to it. He brushed his hand through his hair, putting some order to it, before opening the door. Upon seeing Siri there, he gave her a bit of an awkward smile. "Hello," he greeted, suddenly not completely sure what he should say.