I would call Airbnb and get them to remove the line for privacy reasons, or reasons of inappropriateness. They are not keen on editing reviews unless it breaches the rules and I think relationship status should be one. For future reviews, just call them ''guests'' as in ''Excellent guests, than you for staying''. Or ''Troy & co were lovely guests, blablabla. '' Never assume relationship or gender, there are pitfalls out there!
Totally agree with @Sandra126, naming guests can be an iffy proposition - hope you can get this one edited @Renee42. I've gathered so much valuable info here in the forum, and one thing was to just refer to the guest who booked by name, leave all other parties out of it even if they may have told you their names, they are just "& guests", "& company". Relationships change and sometimes mentioning names of guests will come back & bite you. - Karen
I always name both guests - just by their first name, and never with a relationship title. As a host, I like seeing reviews left for both parties so I know both people are going to be good guests. It's all too often we see complaints here on the forums saying "The booking guest was lovely, but their companion was a nightmare!" I want future hosts to see that both people were great.