Pointing to a man in a photograph, Lalremsiami said, "His father is my father's father." How is the man related to Lalremsiami?

Explanation

1. 01

   The man's father is Lalremsiami's paternal grandfather, so the man is a son of that grandfather.

2. 02

   Lalremsiami's own father is one such son; if the grandfather has another son, he is her paternal uncle.

3. 03

   Nothing says whether the grandfather has one son or more, so the man may be her father or her paternal uncle: it cannot be determined.