Hello.My name is ken.I am from England.This is a photo of my

Hello.My name is ken.I am from England.This is a photo of my family.Look,this is my grandparents.
The man is my father and the woman( ) ( )him is my mum.That is my uncle john,mu father's brother.The woman is father's sister is my aunt Susan.The boy in front of them is their son,my cousin Peter.
Who is the boy ( ) ( ) ( )my parents?Haha,it's me.