McGonagall couldn't help but smile and get a little teary-eyed whenever she saw James Sirius, and Fred. They reminded her of the 3 students who died saving Hogwarts and the magic world (and were pranksters), and made her want to tell them about the great people they're named after, but she knew that Harry already told them that. She had to contain herself every time. Sometimes, they would go to her and ask what James, Sirius, and Fred were like, and she would always smile, remembering those times.