Final answer:
The excerpts do not provide enough information to determine who greets the real Vincentio at the door. A specific text reference is needed to accurately answer this question.
Step-by-step explanation:
The excerpts provided do not directly answer the specific question as to who greets the real Vincentio at the door. This question seems to relate to a scene from a literary work, such as a play or novel, in which a character named Vincentio appears. Without reference to the specific text in question, it is impossible to provide a factual answer. If the question relates to William Shakespeare's play 'The Taming of the Shrew,' then it would be Vincentio's own son, Lucentio, who greets him. However, the provided excerpts do not appear to be from that play and thus it is recommended to refer to the specific text where Vincentio is a character for an accurate response.