5 and 6 seemed to be the height of defiance for our dd, *so far* - she is only 7 and although still defiant, not just rolling on the floor kicking (most of the time). So that's better. wink
I could be wrong, but I think the homeschooling may be helping. If we want to be able to influence her and have her accept our say-so, being with her more probably helps.

Ds was a pretty reasonable child, though he had his share of tantrums at 3 and 4. He seems to be maintaining a desire to please. Now at 13 to shock and dismay us he will jokingly roll out a bad word or say NO! when he is really really not into something, but so far doesn't show any more than normal signs of sliding into independence.