The situation is as follows: I want to give the two godparents of my child some BTCs. You know, just in case something happens to me and to allow them to buy things for my child in the future.

Now, my plan is to give several denominations to them but 'divided', so half of each key or wallet to each. In other words, they both need to agree to spend BTCs on something. However, halving a wallet file is no problem to me, but they are not computer literate. Also, I may be computer literate but have very limited knowledge of keys and wallet files and do not know if that is actually doing the job, or may be open to single-sided spending (when helped by a geek).

So I have a challenge, namely how to get done what I want, but safely and in such way that they can figure out how to spend the BTCs.

1) What is a safe way to split a key or wallet file? (or maybe on paper?)

2) How to provide simple but adequate instructions on how they can combine those keys or wallet files?

3) How to explain in lamers terms where and how to spend BTCs?