Holding Bitcoin long-term can expect to make huge profits. So keeping bitcoins for your children would be a good decision. As someone said above, it is not wise to put all your eggs in one basket. So it is wise to diversify your portfolio. Now I will not only keep bitcoins for my inheritance, I will invest in bitcoins with 33% and buy land with 33% and buy gold with 33%. This is my plan, other people have different plans. However, if you want to buy bitcoins for your inheritance, store the bitcoins in a good wallet.
With Bitcoin, it's your keys, it's your coins, and if you want your children inherit your coins, make sure you leave your Bitcoin private keys or mnemonic seeds somewhere that they will be able to access in future. Furthermore, it's necessary to have a guide for them to use what you give them in future in case you no longer there to help them importing wallet.
Split your wealth to three parts: Bitcoin, land and gold, I see you have a good capital management but I'd like to reduce percents for land and gold. I would like to assign 70% or 80% of my capital into Bitcoin, others are in real estates, land and gold.
Thoughts on inheritance planning for crypto asset owners.