That is to take care of put the child and exercise your mind.
The boss, since he dares to rest assured that his precious son will be given to you to take care of, proves that, to a large extent, he trusts you very much. However, you have to remember, he is not necessarily 100 percent completely able to trust you unconditionally, there may also be a test that you do not notice, you should always accompany the careful, do their own thing. In return for you being able to take care of your children, you will be able to gain the trust of your boss, which may have immediate benefits in the short term. If you have some ability to do things and have the potential to do so, then you will be able to get close to or into part of his circle and thus be able to gain the capital and status to advance.
In any case, do not move the child to vent their anger, that is not only a matter of character in the world, but also can be involved in the moral and rule of law on the level of the problem. You have to put up with it and never lose out on the little things, or you're really a big loser.
Remember, that 40,000 dollars, no matter how a penny do not privately into your pocket, every spending are bookkeeping, and so the boss came back, the account book and the remaining money to him. Even if he doesn't show anything on the spot, you don't complain to others, including the kid. Even if you don't reach the big goal, don't be disappointed. At the same time, make friends with the kid, who is obviously a genius and may surprise you with something unexpected. Take care of that kid from the bottom of your heart, don't be fake, you won't be able to hide from that kid's eyes.
Good luck!