Yes, I guess. Maybe it is because english isn't my native language...but if i was at a party and make a question in the third person, usually the person named wouldn't answer this.
For example: if sara and Diana are standing next to each other and I say.... Does Sara like pets?, it would seem awkward for Sara to answer.
Sure. There is a person named Sylvia.
Would Sylvia respond to this question?
That person has a truth property: Sylvia(Truthful) or Sylvia(Liar).
Any person knowledgable on the subject, (that includes Sylvia) can respond to the question: Sylvia(Liar)?
I was uncertain about these:
"Aren't you Sylvia?" Do you say yes or no truthfully if you are?
"Are you twins?" And "are you Mia?" Don't seem to resolve it.
"Sylvia, want this?" Might decompose to "are you Sylvia AND if so do you want this?" Which the sister could respond to.