This is about the film by that name, but if the short story or the novel are similar enough (I've not read them) information from them could be used to make a guess.
Andrew Martin is physically a standard android (in the beginning) but unlike all others he begins to develop his own personality, creativity and feelings. Eventually he becomes more and more biological and, at the end of his life, is formally recognised as a human being.
In the real world, I'd expect all kinds of TV stations and newspapers to be all over him the moment even a hint of his sentience left the Martin family -most likely when he got a lawyer to allow him to open a bank account. Yet in the entire film we don't see any indication that the press knows about him until the second (if I'm not mistaken -could be the first) time he tries to be declared human, when a TV station's van is parked outside the court. This is several decades after he becomes his own person and stops being property of the Martins.
Did nobody except the people he introduced himself to know that there's a sentient robot named Andrew Martin until he went to court? How did he avoid this happening when several people must have seen a robot in clothes wander around the USA (or perhaps other countries as well) introducing himself to other robots? He also lived in his own house (which he must have a permit for) even before he looked human.
The answer to this could change some characters' interpretation. For example, when Rupert first sees him he accepts without question that Andrew is a person and that he has his own money, which is enough to fund Rupert's research. It seems to show how open-minded and accepting Rupert is, but if Andrew's existence was common knowledge then Rupert is simply surprised to see him in his office.