Most hackers nowadays are developing and evolving , adapting to security improvements. Though, saving Bitcoin for your children's future is a noble idea. Maybe you can keep BTC for yourself first and when the time you need it for your kins, you can cash it out and buy another investment like a property. Bitcoin market is volatile, so it is best to keep track of it.
I agree. It'd be better to recognize bitcoin as a normal currency, therefore by saving it for children, you would just save some money for them, but don't put everything into bitcoin, as you don't know what will happen to it in 15 years. I know that many people believe in bitcoin as it's the first cryptocurrency, but I personally believe that in 10 or so years, new cryptocurrencies will be so advanced that old bitcoin will become extinct and only used by oldschool enthusiasts. So invest in cryptos as a general to get some money for your children in the future, but don't focus on a single wallet that you will give them in after 18 years when they are adults, as it can become worthless then.