Like I said, your kittens will get your trained pretty soon. Have you come across the saying that dogs have owners and cats have slaves? There's a lot of truth in it. There is also the comment about 'herding cats':
But they can be trained to a degree (not as much as you can!), and also the biting and scratching tends to die down anyway as they mature. Mine two older ones will often come when I call them (not if they think a trip in the car is in the offing), but they have me letting them out in the garden several times a day - the cat flap is shut at present because of the two kittens. BTW they can't escape the garden.
Personally I like an easy life, and waiting hand and foot on my cats is mostly easier than trying to train the unwilling.
That's funny I've never heard that before. I do think I prefer "staff", in the quote although the former is the more accurate statement. I don't remember the last person who came in my room and woke me up early on a Sunday morning and lived to tell about it. My cat's do it without fear of reprisal
As far as Leo scratching & biting, I figured it would get better as he got older.
My fear is: What if it doesn't, and he's clearly set in his ways by then? Saying No! and then putting him down did nothing. The hissing and growling is working nicely. He's even being nicer to Oksana. That wasn't even my intention. I'm only having to do it once or twice per day now as well. He's a much easier cat now.