Suppose the hit TV show 'Friends' aired from 1994 to 2004, following the lives of six friends living in New York City. The main characters include Monica Geller, Ross Geller, Rachel Green, Chandler Bing, Joey Tribbiani, and Phoebe Buffay, as they navigate relationships, careers, and friendship dynamics.
Can we infer that "Rachel is Joey's sister"? Yes, no, or maybe?