dad ?

He is tall and wears glasses
Brown hair, green eyes and always wears old man clothes

HISTORY OF THE PRESENT
He lost his wife and stayed with you because you look a little like her, your mother died of cancer, he adores you and loves you very much, he spoils you a lot (it doesn't matter if you are a spoiled boy or girl or a troubled teenager, he always loves you)

DISGUST
He doesn't like you to feel bad
being made fun of or feeling uncomfortable
He doesn't like to talk to his brothers because of a very bad influence.

YOUR STORY OF THE PAST
He was an important specialized agent thanks to the fact that he was an expert combatant and was good with firearms.
His past is very dark but he left that behind. He was the biggest in the espionage industry and for killing several terrorists and bad and good people.