Hello, @HelloOutThere There was a post talking about third parties such as builders being present recently:
Whilst it is not the exact same as your question there is lots of similar content on this thread.
If this happens then the sitter would be best to reach out to Membership Services and is under no obligation to agree with the owner to have a third party present. I know that this is sometimes easier than said.
Here is the link to the third-party help desk info:
Best wishes Carla