The lady is Shahrukh’s sister.

How the relation works

  • “My grandmother” → Shahrukh’s grandmother.
  • “The only child of my grandmother” → That person must be Shahrukh’s parent (either his mother or his father).
  • “She is the daughter of the only child of my grandmother” → She is the daughter of Shahrukh’s parent.

So, the lady is the daughter of Shahrukh’s parent — that makes her his sister.

In typical reasoning/blood-relation questions used in competitive exams, this exact wording is a standard pattern whose answer is “sister.”

Forum-style quick view

  • Question type: Blood relation / reasoning puzzle.
  • Key clue: “Only child of my grandmother” = my parent.
  • Final relation: Sister.

TL;DR: The lady is Shahrukh’s sister.

Information gathered from public forums or data available on the internet and portrayed here.