I wouldn't call it injustice, but I recall a sense of fundamental unfairness that I think comes from the power differential between child and parent (or any adult, or even a more confident other child). For example, if my mother shouted at me, she might or might not have gotten what she wanted, but I certainly felt horrible aout myself afterwards either way. If I tried to do the same at ... pretty much anyone, I not only didn't get what I wanted, but likely got punished or at least told in no uncertain terms that I'm bad. If my mother gave me the silent treatment, it was scary as hell. If I tried the same, I might have been told to stop sulking, or it might have gone unnoticed altogether. These are more just generalisations from some vague fragments of feelings and images, where the common thread seems to be the sense of powerlessness to defend myself to make the same sort of impact that's being made on me, or feel like I've 'won' in any way at all. I'd have trouble recalling specific situations.