Blood relations (chain): Determine Sonia’s relation to Aamir from a nested description. Aamir says: “She is the wife of the only nephew of the only brother of my mother.” Work through mother → her only brother → his only nephew to identify who Sonia is to Aamir. Choose the correct relationship.

Unpack the chain

• “Only brother of my mother” ⇒ Aamir’s maternal uncle (unique).
• “Only nephew” of that uncle ⇒ among the uncle’s siblings’ sons, there is only one male—this is (most parsimoniously) Aamir himself.
• “Wife of [that only nephew]” ⇒ wife of Aamir.

Conclusion
Sonia is Aamir’s wife.

Common pitfalls
Overcomplicating “only nephew”; the minimalist consistent resolution is that Aamir is the only male child among his maternal uncle’s nieces/nephews.