Our immediate impression of Mr. and Mrs. Das is that they are not very caring parents. They "bickered" about which one of them has to take their young daughter to the bathroom, and Mrs. Das loses when "Mr. Das pointed out that he had given the girl her bath the night before." It seems as though being with their children feels like an obligation in which they take little (or no) joy. Mrs. Das "did not hold the little girl's hand as they walked" toward the bathroom. She also seems a little superficial as a result of the description of her "shaved, largely bare legs"; she must spend some time on her appearance, more than she spends caring for her kids. Further, when she meets Mr. Kapasi, she "flexed one side of her mouth, smiling dutifully at Mr. Kapasi, without displaying any interest in him." This makes her seem kind of rude and, perhaps, even self-centered. These are hardly flattering descriptions.
Mr. Kapasi, at first impression, seems observant and patient. Though he is driving the Das family on a sight-seeing trip, he has to stop fewer than five minutes into the trip because the little girl begins to complain. He also seems, at first, to refrain from judgment; he notes the family's behavior without remarking on it.