I personally do two things for my family. I pay for the family edition of 1Password, and I have a family vault which includes everything that we need to share.

I personally do two things for my family. I pay for the family edition of 1Password, and I have a family vault which includes everything that we need to share. My wife has also stored my master credentials in her vault, and I have done the same with hers. We mostly store bank cards and logins in 1Password, and while it can also store docs, we actually use my second solution instead. The second solution is the deployment of a Synology NAS DS1019+. I have set up an account each for our digital lives; photos, docs etc. and for redundancy I also use backblaze. All of the Synology creds are stored in 1password.