Marek got to his feet when the knock came, though he let Melinda beat him to the door. Trying to race for it would just be silly, especially when the door would be opened regardless. He was with Melinda on this one: answering the door themselves, whichever one of them it was, was a bit awkward. Probably would have been less so under other circumstances, though.
"Hi," he said, grinning at Felixa. He didn't really know what was appropriate for greeting her under these circumstances, but he didn't overthink it, stepping in to press a brief kiss to her cheek. "Felixa, this is my sister, Melinda. Melinda, Felixa."