son's
Examples
Better spend an extra hundred or two on your son's education, than leave it him in your will.
A good friend of my son's is a son to me.
Can you let your son's body become the same temperature as your son's head before you turn this into a political campaign against the president? Could you do that?
A mother's lesson – a son's success.
For the first five years of your son's life treat him as a prince, for the next ten years as a slave, then as a friend for the rest of his life.
Don't give your son's wife fall-harvest eggplant to eat.