No one except Longbottom says a word to him about the deaths of his parents, and even Longbottom never mentions it again. He’s not sure if Longbottom cautioned them or if nobody cares. It’s easier for him this way. His father raised him to believe that any sign of sorrow or grief was evidence of weakness. He doesn’t really believe that now, but the discipline is useful. He goes through his training exercises and household duties exactly as he did before. He doesn’t say that when the Dark Lord summons his followers, his left arm feels like a hot iron has been pressed to his skin. As long as he has no reaction to show that he is in pain, it’s easy for everyone to believe that he’s not. He doesn’t try to tell them otherwise. There’s no point.