“Her father-in-law is my father-in-law’s father”, how are they related?

Question

The Traffic police stops them at a signal.
He asks them How are they related.
So the boy answers : “Her father-in-law is my father-in-law’s father”

Question: How they are related?

Answer 1

Mother in-law and Son in-law

Comments

appears to nbe correct

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this is one solution...the other is she is his wife's uncle's wife...

Answer 2

They are...Mother in law and Son in law in relation

Answer 3

his mother in law.