Re: I'm just thinking about to give away to my 4-year-old nephew a 0.01 BTC
That's the max that I can afford at the moment (I'm 22) but I want to save it on a wllet of paper and give it to my sister telling her to keep it safe and that we will give it to him when he is 18 years old. Do you think is a nice idea? 
Probably that was a good idea and I do salute you for that. Thinking that in your younger age you've already think what will be the best thing to give to your sister and it can she possible using it in the near future yo have her a better life. That is really a good decisions and hopefully you will succeed to your plan. Just be careful and be much smarter yo put that in the proper and safest place so your effort won't be wasted.