Question

Pointing to a boy, Mrs. Mira said, He is the only son of my grandfather's only child. How is the boy related or Mrs. Mira?
(1) Cousin
(2) Uncle
(3) Sister
(4) Brother
(5) Cannot be determined

Answer 1

The answer is (4)Brother, because the Grandfather has only one child, and the child has only one son, but it is not told if he has one child or two. 

Answer 2

Answer:

THE ANSWER IS A/1 COUSIN

Step-by-step explanation:

NOW LET'S MAKE A FAMILY TREE  

GRANDFATHER -> 1 SON -> MIRA

                               2 SON -> WHOM MIRA WAS POINTING TO

Hope It may help you