Answer: his brother.
Reason: By the way you phrased the question I am assuming that the author is also a part of the story. Since the author is part of the story, and therefore a character, he can not know about his father when he was younger, only narrators can do that. Also the same goes for the grandfather. Since the author is also a part of the story, most probably the main character, he would not refer to himself in third person. Therefore through process of elimination his brother in the only possible option left.
Culture moderates the level of self-esteem in an individual because it contains certain aspects of their lives, such as their values and beliefs, which become the forefront of how one measures their worth. Self-esteem is a holistic concept, and it is not only impacted from within, but by one's surroundings as well.
Is there a passage to go with this? If so please copy and paste it so we will be able to help.
Answer:
To show the reader the exact words that a character is speaking.
Explanation: