”
In this quote, Albus Severus is being praised by his father, Harry Potter. Harry is telling Albus that he was named after two great Headmasters of Hogwarts, one of whom was a Slytherin. Harry is saying that this Slytherin Headmaster was very brave and was the bravest man he ever knew. Harry is telling Ginny this quietly, so that no one else can hear. Ginny is being very nice, and pretending to wave to Rose, who is now on the train, instead of listening in.