An only child is often stereotyped as spoiled.
She was an only child who had been very welcome.
Dad was an only child and his Mother died in her twenties.
Then Ronnie got up and said how he and mom loved each other and how she still loved her daughter Annie and it sounded like my sister was her only child.
It destroyed everything, and I was an only child from a small family.
Her sudden heart attack had frightened Cynthia, reminding her as an only child she was her mother's sole resource.