Knowing we don't have any of the cool toys (trucks/trains/cars etc), he smartly brought some of his own trains, and it didn't take long for him to break them out. Milena mostly used them as phones (wait, boys and girls play in the same way, right??), and Henry wasn't sure what to do about that. Mostly he ignored the misunderstanding and repeatedly asked her to put the train on the track. She happily ignored him and said 'hi' repeatedly into the train-phone.
Then I asked Henry some questions. Things started getting pretty fishy pretty quickly. When questioned about his new sister, he was able to confirm that she was 'little', her name is Tess, that she was loud and that she had 'two arms'. But the details get sketchy after that. Henry reports she enjoys playing trains and swimming, and that she has 'three or four' eyes, 'two or three' noses and 'four or five' feet. It was Milena's turn to be skeptical, and she didn't hide it well.
Fortunately, they were able to get past all of that and they had a really great time together.