Jack's Ma, possibly sensing Ennis' deep emotions, seems to try and comfort him, puts her hand on his shoulder, squeezes ever so gently, and says:
I kept his room like it was when he was a boy, I think he appreciated that. You are welcome to go up to his room, if you want.
Ennis, struggling to talk, to get some kind of words out of his mouth, looks at her with sadness in his eyes, and says in almost a whisper: Yeah, I'd like that, thank you.
He begins the journey up the stark white stairs to Jack's boyhood room.