Question

PQR is the daughter of the son-in-law of XYZ's mother's only child. How PQR is related to XYZ?
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Answer 1

XYZ's mother's only child = XYZ because XYZ's mother has only son .

XYZ's son in law is his Damaad. Damaad 's daughter is also Damaad's wife's daughter and Damaad's wife is XYZ's daughter . Hence , from this we can conclude that :

PQR is the daughter of the daughter of XYZ .

Therefore, XYZ is PQR's grandfather.