buy a laptop (cheap off craigslist)

setup armory https://bitcoinarmory.com/  offline version of course

create a paper wallet backup

go and see your lawyer and setup a security box that is to be opened only upon your death.  make sure it is all in the will and properly setup.

put it all in the box along with whatever disposable bitcoins you have so your family or loved ones are taken care of when and if you die.  make sure you include instructions on what to do with BTC

don't like this idea OK but ask yourself .... am i OK with my family loosing all my bitcoins i have in a brainwallet.  are they counting on that money?

there are  good posts about how to do this properly if you do a search