PARIS: I just have to let Nanny know. [takes out cell phone and dials] Nanny? É Paris. Vou jantar com Rory hoje à noite. Eu telefono no caminho de casa. Tchau.
It’s notable that Paris is now seventeen and still has a nanny, as if she was a small child. Presumably her nanny has been kept on as a loyal retainer and become part of the family, now acting as more of a companion to Paris. Because of Nanny, Paris has become fluent in Portuguese (it is perhaps slightly surprising that Nanny hasn’t become fluent in English after all these years).
Also note that Paris must have spoken about Rory to Nanny often enough that she doesn’t need any explanation or reminders of who Rory is.