At any rate don't tolerate the behavior.
It can be very scary, but you have to stand up to them. Remember that you can sit on them and crush them. Don't be afraid. You are a human! You've killed mammoths! Do it once, and you may never need to do it again.
You should not give the raw bones again, until you are ready. And be ready. Start with something less, a chew stick, but do not let go. Hold him/her by the scruff, and take it back. Stand up and show that it is your bone. It is a show. You are alpha.
If they growl and try to take it away, you have to chase them down and get it back. Several times I have had to do this, but the pay off is huge. Now, if they have something that they are not supposed to have, a dead bird, or something, they will reluctantly drop it, when they see that I am serious.
They definitely say, "please,...can I keep it?" Or sometimes they skitter around to get away from me pulling something out of their mouth, but in the end, when I use my kind, serious voice, they relent.
And there is the crux: it's me, and how I react, that makes the difference.
When you are Alpha, they will back down. The behaviors you describe are all ways that they are testing the pack order.
And don't be mad at them. In their minds, they can run faster, jump higher...why shouldn't they rise in the pack? We have to out think them. We use our voice and our body language, and we show them that we control everything around them, especially, the food.
Look at it as an opportunity, to reaffirm the pack order.
No growling at children. Absolutely not. After you are feeling confident, then you watch while your child does the same stick give/take away.