Elspeth is in a comfy chair in her quarters with Harley on her lap and a picture book in her hand; she appears to have just finished the story and is letting Harley behold the final illustrations. "Hello, Nathaniel. Hi, Renata. This is Harley."
"Nathaniel is Micaiah's brother. Micaiah's one of your alts," says Elspeth to Harley.
(Depending on how much Harley understands about mating, this might already be obvious from how she's sort of draped over Nathaniel staring at him like he's the only visible object in the room.)
"Yes, it is pretty cute, isn't it? Nathaniel is from Samaria but he's stuck here until Jane comes back or someone can find a door to Milliways. Later today I'll try some more doors."
"Harley has a refined sense of taste for cuteness," says Elspeth, petting the toddler's hair.
Elspeth laughs. "I think Nathaniel thinks you're cute, little nibbler," she tells Harley.
"Yes, he is. You are very cute." She puts the book she was holding down, and she hugs Harley back, and then she lets him go, in case he'd like to wriggle out of her lap and go investigate his alt's brother more closely.
"You'll grow," laughs Elspeth. "You will get to be six foot one and then you will stop."
"Harley, if you bite him, he will not like it, I will not put you back in biting distance of him or other humans again while you have that habit, and Renata will hiss at you and be very upset," says Elspeth.