Question

Relation whom Rama, Meet
Rama told Lakshmana, 'Yesterday, I met the only brother of the daughter of my grandmother. Whom did Rama meet?

Answer 1

This means that Rama's grandmother had atleast one daughter and a son. I am assuming the grandma to be from Rama's paternal side.

In this case, Rama would have met his father. You may want to look at the family tree I have created for you below.

         Grandmother
--------------------------------------
   |                             |
   |                             |
Son                      Daughter
------
   |
Rama