Family 1Password for me + spouse, separate 1Password account for my elderly parent–in–law. I maintain paper copies of all keys.
I back up (export) 1Password vaults quarterly to an offline backup I maintain.
I maintain two small (1Tb) SSDs with digital copies/scans of all important documents, offline. Try to sync monthly. Store inside faraday bags inside fireproof (in theory) safes.
We both lie excessively when creating profiles for online accounts. Unless absolutely necessary we use a PO Box for addresses. We've both been online 30+ years and the amount of old, forgotten accounts that resurface in breaches and scams is disappointing, and yet not surprising. Our late dog continues to receive a lot of "growth hacking" spam from services that started after she died.
Everything important has multiple 2FA options enabled, avoiding SMS as much as possible.
All of our financial accounts use email addresses off an obscure domain name I manage, not our personal email addresses (which themselves are G Suite/WorkPlace/WorkSpace/Whatever accounts).
I review all financial accounts monthly to look for odd charges. The last serious fraud we experienced started as small (I just assume we'll get hacked at some point, instead of trying to make that impossible, I try to ensure that we have backups of everything (and a paper trail as necessary to prove who we are, though I'm not convinced the various automata at FAANG gang companies will believe any of that).