A stepson is the son of your husband or wife, but not of you.
Having stepsons can be a good thing if you all get along well.
Examples:
Her stepsons are very nice to her.
Do you have any stepsons?
The stepsons play with their toys.
The stepsons help their stepmom cook dinner.
Her stepsons are as tall as trees!
The stepsons love to play with their dog.