If you write a seed phrase or words we can't consider it as brain wallet but a paper wallet because we can only call it brain wallet by memorizing the seed phrase. That is why Brain wallet is a bad idea. 12 to 24 words is not easy to memorize so having a hardware wallet is the best option without memorizing the seedphrase.
I think you just don't understand or confused about the concept of brain wallet.
You are right. Thanks for correcting me on that. I realize I don't have exact term for the way I am going to protect my BTC. I don't like BTC paper wallet because of the possibility of losing it or it gets too damaged for me to read it. I don't like hardware wallet because I cannot customize the seed phrase to what I want (Ledger Nano, ie).
Now, here is my solution. I can create a private key using 20 words. And I can make the last 5 words something only I know. I can email my family (and myself) the first 15 words. Then, I can email them the clues of my last 5 words. Of course, I have to do a damn good job that only the ones I fully trust know the answers. So, I guess my method is 3/4 paper - 1/4 brain wallet?
I would appreciate some feedback on this idea of mine.
Do you really think is it worth to do all this effort, instead of just buy a hardware wallet because you want to customize?
The key here is safety, and for now the hardware wallets are one of the best methods available and it's simple