Raman is talking to a lady, he says, “You are mother of my mother’s sister’s brother”. What is the relation of this lady with Raman?

To determine the relationship of the lady with Raman, let's analyze the statement step by step.

1. Identify "my mother's sister": Raman's mother's sister is Raman's aunt.

2. Identify "my mother's sister's brother": The brother of Raman's aunt is Raman's mother (since the aunt is the sister of his mother).

3. Identify "mother of my mother's sister's brother": Since we established that "my mother's sister's brother" refers to Raman's mother, the mother of Raman's mother is Raman's grandmother.

So, when Raman says, “You are mother of my mother’s sister’s brother,” he is referring to his grandmother.

Conclusion

The lady is Raman's grandmother.