I am still living with my siblings and ihave done some research about crypto wallets online, they said keeping your recovery words offline is the best way, now I plan to write down my recovery seed in my book, remember I said I live with my siblings, I can't guarantee myself that they won't get to where I write down the words, my brothers and sisters are still younger than me but I don't know if they knew anything about crypto and wallet, but I have an idea, if it's stupid do tell me. 

I plan to write down only ten words out of the twelve and cram the two missing words in my brain, maybe the 5th word and the last word,  is this a good way or you have a better way to go about this? Please tell me.