You can try. My mum is the most stupidly honest and ethical person I know and if I were a bit less juvenile I'd probably admit that she's an amazing parent (and a single mother for half my life to boot). My brother inherited it from her. I picked up enough to be a more-or-less functional member of society instead of ending up in a mental institution or prison. My sister is still young enough that she hasn't grown out of her childish selfishness and she still constantly complains that things "aren't fair", ranging from me having a car (I paid nearly half the cost myself, and she's not anywhere near old enough to even get a permit anyway) to me getting a larger portion at dinner to my mother refusing to buy her a $1000 tablet PC on a whim.
Edit:
I'm thinking primarily little kids, ranging up to ~14 years old, depending on various factors. Once they get past the worst part of puberty and start the long slog of growing a proper prefrontal cortex they start to become real people.
I'm basing this in part on anecdotal observation of small children and primarily on my tween sister.