I mean why go this weird when you could literally store it on your binance account? If I ever die, or I am in a coma or whatever reason I can't reach my coins, my family could use my phone to just end up with account access just like I do. It doesn't require to be "me", it requires someone to know my email, my password, and have my phone for 2FA, all of which my wife has.
Oh dear. Let's ignore
all the reasons (and there
are a lot of them) you shouldn't store coins on a centralized exchange even when you are alive, from censorship and lack of privacy to hacks, thefts, scams, and bankruptcy. From the Binance Terms of Use:
The Binance Account can only be used by the account registrant. Binance reserves the right to suspend, freeze or cancel the use of Binance Accounts by persons other than account registrant.
If Binance ever find out that your wife is accessing your account, then she can wave goodbye to all of your coins, since your account will be immediately suspended. In classic Binance fashion, probably the only thing which would allow her to unfreeze your account is for you to complete "enhaned KYC" or some other such nonsense, which of course will be impossible after your death.