I'm bothering with a way for the people I care the most to be able to recover the bitcoins in case of my demise.

Let's say there are two people I trust the most in my life and let's call them A and B.

What I have come up with at first was to create an offline paper wallet and give the details of it to them.

But that approach is not enough to give me peace of mind because empowering them with full access to my investments still has risks.

E.g. person A's partner might try to convert my BTCs to fiat and buy me real estate with them because he/she worries about my future and holds the belief that this "internet money thing" is too dangerous for me.

Or e.g. person B's partner is not trustworthy enough to me.

It is unlikely that person A and person B or their respective partners will ever join forces, unless in case of my demise.

So I am thinking: what if I split the private key in two, and I give half of it to each person?

To my understanding, with BTC we use 256bit encryption but in reality we only are 128bit secure. So if I split the private key in 2 each party would have to guess 64bit to recover the full key.

Your thoughts?