They were pious people, Muslims, who believed the twin babies were a sign of double luck, and they were sure of this when, later in the evening, they discovered how valuable the babies were. She and her husband had never seen rings and bracelets like those. And while they admired the pictures, knowing the babies came from a good family, neither of them could read or write. It was not until many months later that Mei Ching found someone who could read the writing on the back. By then, she loved these baby girls like her own.

In 1952 Mei Han, the husband, died. The twins were already eight years old, and Mei Ching now decided it was time to find your sisters' true family.

She showed the girls the picture of their mother and told them they had been born into a great family and she would take them back to see their true mother and grandparents. Mei Chang told them about the reward, but she swore she would refuse it. She loved these girls so much, she only wanted them to have what they were entitled to-a better life, a fine house, educated ways. Maybe the family would let her stay on as the girls' amah. Yes, she was certain they would insist.

Of course, when she found the place at 9 Weichang Lu, in the old French Concession, it was something completely different. It was the site of a factory building, recently constructed, and none of the workers knew what had become of the family whose house had burned down on that spot.

Mei Ching could not have known, of course, that your mother and I, her new husband, had already returned to that same place in 1945 in hopes of finding both her family and her daughters.

Your mother and I stayed in China until 1947. We went to many different cities-back to Kweilin, to Changsha, as far south as Kunming. She was always looking out of one corner of her eye for twin babies, then little girls. Later we went to Hong Kong, and when we finally left in 1949 for the United States, I think she was even looking for them on the boat. But when we arrived, she no longer talked about them. I thought, At last, they have died in her heart.

When letters could be openly exchanged between China and the United States, she wrote immediately to old friends in Shanghai and Kweilin. I did not know she did this. Auntie Lindo told me. But of course, by then, all the street names had changed. Some people had died, others had moved away. So it took many years to find a contact. And when she did find an old schoolmate's address and wrote asking her to look for her daughters, her friend wrote back and said this was impossible, like looking for a needle on the bottom of the ocean. How did she know her daughters were in Shanghai and not somewhere else in China? The friend, of course, did not ask, How do you know your daughters are still alive?

So her schoolmate did not look. Finding babies lost during the war was a matter of foolish imagination, and she had no time for that.

But every year, your mother wrote to different people. And this last year, I think she got a big idea in her head, to go to China and find them herself. I remember she told me, "Canning, we should go, before it is too late, before we are too old." And I told her we were already too old, it was already too late.

I just thought she wanted to be a tourist! I didn't know she wanted to go and look for her daughters. So when I said it was too late, that must have put a terrible thought in her head that her daughters might be dead. And I think this possibility grew bigger and bigger in her head, until it killed her.

Maybe it was your mother's dead spirit who guided her Shanghai schoolmate to find her daughters. Because after your mother died, the schoolmate saw your sisters, by chance, while shopping for shoes at the Number One Department Store on Nanjing Dong Road. She said it was like a dream, seeing these two women who looked so much alike, moving down the stairs together. There was something about their facial expressions that reminded the schoolmate of your mother.

She quickly walked over to them and called their names, which of course, they did not recognize at first, because Mei Ching had changed their names. But your mother's friend was so sure, she persisted. "Are you not Wang Chwun Yu and Wang Chwun Hwa?" she asked them. And then these double-image women became very excited, because they remembered the names written on the back of an old photo, a photo of a young man and woman they still honored, as their much-loved first parents, who had died and become spirit ghosts still roaming the earth looking for them.

At the airport, I am exhausted. I could not sleep last night. Aiyi had followed me into my room at three in the morning, and she instantly fell asleep on one of the twin beds, snoring with the might of a lumberjack. I lay awake thinking about my mother's story, realizing how much I have never known about her, grieving that my sisters and I had both lost her.

And now at the airport, after shaking hands with everybody, waving good-bye, I think about all the different ways we leave people in this world. Cheerily waving good-bye to some at airports, knowing we'll never see each other again. Leaving others on the side of the road, hoping that we will. Finding my mother in my father's story and saying good-bye before I have a chance to know her better.

Aiyi smiles at me as we wait for our gate to be called. She is so old. I put one arm around her and one arm around Lili. They are the same size, it seems. And then it's time. As we wave good-bye one more time and enter the waiting area, I get the sense I am going from one funeral to another. In my hand I'm clutching a pair of tickets to Shanghai. In two hours we'll be there.

The plane takes off. I close my eyes. How can I describe to them in my broken Chinese about our mother's life? Where should I begin?

"Wake up, we're here," says my father. And I awake with my heart pounding in my throat. I look out the window and we're already on the runway. It's gray outside.

And now I'm walking down the steps of the plane, onto the tarmac and toward the building. If only, I think, if only my mother had lived long enough to be the one walking toward them. I am so nervous I cannot even feel my feet. I am just moving somehow.

Somebody shouts, "She's arrived!" And then I see her. Her short hair. Her small body. And that same look on her face. She has the back of her hand pressed hard against her mouth. She is crying as though she had gone through a terrible ordeal and were happy it is over.

And I know it's not my mother, yet it is the same look she had when I was five and had disappeared all afternoon, for such a long time, that she was convinced I was dead. And when I miraculously appeared, sleepy-eyed, crawling from underneath my bed, she wept and laughed, biting the back of her hand to make sure it was true.

And now I see her again, two of her, waving, and in one hand there is a photo, the Polaroid I sent them. As soon as I get beyond the gate, we run toward each other, all three of us embracing, all hesitations and expectations forgotten.

"Mama, Mama," we all murmur, as if she is among us.

My sisters look at me, proudly. "Meimei jandale," says one sister proudly to the other. "Little Sister has grown up." I look at their faces again and I see no trace of my mother in them. Yet they still look familiar. And now I also see what part of me is Chinese. It is so obvious. It is my family. It is in our blood. After all these years, it can finally be let go.

My sisters and I stand, arms around each other, laughing and wiping the tears from each other's eyes. The flash of the Polaroid goes off and my father hands me the snapshot. My sisters and I watch quietly together, eager to see what develops.

The gray-green surface changes to the bright colors of our three images, sharpening and deepening all at once. And although we don't speak, I know we all see it: Together we look like our mother. Her same eyes, her same mouth, open in surprise to see, at last, her long-cherished wish.