The Chandrasekhar family is an Indian intellectual family. Several members of the family have achieved scientific distinction, notably in the field of physics. Two members of the family, Sir C. V. Raman and his nephew, Subrahmanyan Chandrasekhar, were Nobel laureates in physics.
Subrahmanyan Chandrasekhar is the uncle of Raman.
Subrahmanyan Chandrasekhar is the nephew of Raman.  The system was confused by the context and wording.