I think a little overall perspective is needed here.
Please remember that puppies and kittens are just babies, both bite and scratch as a NORMAL part of learning adult behaviour and how to be polite and to try out how their bits and pieces work -- just as young children slap, hit, bite, scream and do other things that annoy us and aren't polite. It takes time and patience with both animals and children. Puppies are not easy, in this way -- it's one reason why many breeders would advise an older dog for homes with young kids or for people who might not 'enjoy' :lol: this aspect of raising a puppy as it goes on for a long time (NB: chewed up furniture, clothes and shoes are the next phase and that goes on for months, too!
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10 weeks is a tiny baby in puppy terms and what you describe is totally normal. It will be many weeks before puppies gradually learn not to puppy bite -- it doesn't happen in a week and puppies this age have little self control; they are learning like sponges and testing their world every moment!
In being removed to a new home alone at 7 weeks, the pup did miss a valuable chance to socialise more with sibs and parents -- this is really too young to home a cavalier or any puppy but sadly some breeders insist on doing this still. Good breeders hold on to puppies til 8-12 weeks before homing. So: that makes the task a little more challenging and behaviouralists note that puppies homed before 8 weeks DO have greater problems.That one week is quite crucial. You are now having to do the extra work that would have been done by mum and siblings, in other words.
The only thing that works is doing what you are doing -- ignoring (at LEAST 5 minutes before you pay attention again to the puppy), yelping, time outs. This must be consistent, kind, but firm. As the puppy gets older these things will stop -- just as most 5 years olds do not throw tantrums the way they did at 2 and don't continue to hit other kids or they have no friends. Puppies, like kids, do learn that certain types of behaviour bring no rewards.
Finally, a child under 12 should never be in a situation where a puppy can bite at ankles, and especially children under about 9 as both kids and puppy are WAY too young and small and unpredictable to be actively walking around near each other. Puppies and kids need to be in very controlled interactions -- eg child needs to be sitting on floor so puppy never has the chance to learn to nip at ankles. Puppy can be held only when child is sitting as a drop -- very easy with a squirming puppy -- from even child waist height could kill or seriously maim a puppy. A puppy darts and runs as do small kids and a devastating accident is just way, way too easy. I know of puppies who have had legs and jaws broken by adults or kids accidentally sitting or stepping on same. Likewise puppy bites hurt small kids and children moving around easily overexcite a puppy into exactly this biting behaviour. Everyone involved is just too small, too immature at this age, too likely to be hurt. growling is NOT a big deal -- it is just a way little puppies learn to vocalise and play. It is NOT aggression just baby play.
Guide on kids and dogs:
http://www.cavaliertalk.com/phpBB2/viewtopic.php?t=1101
