Read the following passage. Answer the question :
It was raining when Rahel came back to Ayemenem. Slanting silver ropes slammed into loose earth, plowing it up like gunfire. The old house on the hill wore its steep, gabled roof pulled over its ears like a low hat. The walls, streaked with moss, had grown soft, and bulged a little with dampness that seeped up from the ground. The wild, overgrown garden was full of the whisper and scurry of small lives. In the undergrowth a rat snake rubbed itself against a glistening stone. Hopeful yellow bullfrogs cruised the scummy pond for mates. A drenched mongoose flashed across the leaf-strewn driveway.
The house itself looked empty. The doors and window were locked. The front verendah bare unfurnished. But the skyblue Plymouth with chrome tailfins was still parked outside, and inside, Baby Kochamma was still alive.
She was Rahel's baby grandaunt, her grandfather's younger sister. Her name was really Navomi, Navomi Ipe, but every body called her Baby. She became Baby Kochamma when she was old enough to be an aunt.
Rahel hadn't come to see her, though. Neither niece nor baby grandaunt labored under any illusions on that account. Rahel had come to see her brother, Estha. They were two-egg twins. "Dizygotic" doctors called them. Born from separate but simultaneously fertilized eggs. Estha- Esthappen-- was the older by eighteen minutes.
They never did look much like each other, Estha and Rahel, and even when they were thin- armed children, flat-chasted, wormridden and Elvis presley-puffed, there was none of the usual " Who is who?" and "Which is which?" from oversmilling relatives or the Syrian Orthodox bishops who frequently visited the Ayemenem House for donations.
The confusion lay in a deeper, more secret place.