apparently a vampire

Id have two nickels...

Which is not a lot

grace lands on calling rocky "he" because he has a split second of panic in one of their first interactions and thinks "uhhh he or she or oh gosh this species might have a dozen sexes and use pronouns I don't even have words for um uh okay I'll just use 'he' because using 'it' for a sapient creature feels wrong. why does no one talk about how to use pronouns in first contact." personally I find this hilarious because it characterizes grace as being just about Gender Aware enough to conceive of and be cool with the idea of sex and gender existing outside of the socially constructed binary and is probably even down to use neopronouns for people, but also a) he still opts for "he" over "they" and b) is completely unaware that zillions of people are absolutely having fifth dimensional discussions about pronouns and first contact.

grace never refers to adrian by pronouns.

grace thinks of adrian as rocky's spouse specifically, not husband or wife.

there's a tiny bit at the end where grace says if he shined a light out of the clear xenonite of his dome then he could "see an eridian going about his business," meaning he's probably just using "he" as the pronoun for all eridians.

Eridians are going to have a fairly solid grasp of the English language (and possibly even some others), an intimate understanding of the environmental conditions a human needs to thrive as well as their nutritional and psychological needs, a solid grasp of a number of scientific concepts discovered by humans, and decent familiarity with human culture and customs (if probably an American-centric one). Some Eridians might even be explicitly trained as diplomats or ambassadors with the expectation that one day the two cultures might interact more regularly.