Bequeathing Ethereum to designated beneficiaries.

55M, separated and two sons.

I have come into a chunk of change and I am in the process of revising my will.

I wish to leave each of my sons a physical wallet containing only Ether, probably $10000. These wallets will be stored in a safety deposit box identified in the will.

The wallets will be in addition to any inheritance outlined in the will.

My questions:

1. How do I ensure that the wallets will be futureproof for accessibility?

2. Is only possession of the wallets required to take ownership of the contents. When I purchase Ether do I need to provide personal ID or can I buy anonymously?

3. Would it be better to buy in my name and officially bequeath in the will or keep it off the books? Just have an envelope with their names on it with the contents explaining what, where and how to retrieve it?

4. What, if any, are the tax implications?

Thanks.