Who Am I?
I am a married woman.
John's son is my daughter's father.
What is my relationship to John?
Drag your cursor between the asterisks for the answer
Daughter-in-law. Her daughter's father is her husband (assuming she's only been married once and didn't have an affair). This means John's son is her husband, so John is her father-in-law, making her the daughter-in-law.