Lie to me all you want, don't lie to yourselves. I have 2 nieces, and they are both great kids. The 5 year old has already punched another girl in the face and shoved her into the pool at water survival, or swim class - whatever you want to call it. The other girl was being mean, so props to my niece for punching her in the face and shutting her up.
My sister blamed me for the incident, because I watch UFC and Pride fights with her. But at least she is getting better at the armbar/triangle/omo plata transitions, and can throw a good punch.
But I'd still like if one of them had been a nephew instead so I wouldn't get weird looks from strangers when I am training them on the front lawn. I really only train the 5 year old. The 3 year old has a natural mean streak and I would feel bad for the beating she gives the first kid who pisses her off, especially if she killed them, which is disturbingly not much of a stretch of the imagination to think about. Yeah, the 5 year old needs the training more...