Examples from the Web for stepsister
A stepsister riding in the car with him during a trip home to Massachusetts also perished.
She did not even thank her stepsister for the trouble she had taken.Good Stories For Great Holidays|Frances Jenkins Olcott
His stepsister got into trouble and died, leaving little David.Green Valley|Katharine Reynolds
The lady who accompanied her he guessed to be her stepsister; indeed, he had seen a photograph of her at Hill Street.The Doctor of Pimlico|William Le Queux