I checked the novel for the exact quote. Here it is:
Quote:
She moved the transducer along the baby's leg. "And my father was a vet."
Malcolm looked up sharply. "Your father was a vet?"
"Yes, at the San Diego Zoo. He was a bird specialist. But I don't see... Can you magnify this?"
Arby flicked a switch. The image doubled in size.
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(Page 281,
The Lost World)
It's implied that Gerry and Sarah Harding are related. What does not at up is that, in the first few chapters of the book, we learn that Malcolm and Sarah befriended one another (and might possibly have been romantically involved.) You could question why Malcolm never inquired about Harding's parents; after all. they spend a lot of time together.
In the film(s), the connection is not made. It seems to me that this will not happen in the game either. From what I've heard, Michael Crichton had a habit of giving several characters from different (not related to one another) novels the same, or similar, surnames.