Hello Judd Larson,
Thanks for posting in the Apple Support Communities.
It sounds like you're looking to share your saved login passwords with Family Sharing, right?
If we have that correct, this doesn't appear to be a feature of Family Sharing as it keeps your personal and private details separate. For more details on this, check out the following resource to review what you can share with Family Sharing, and we'll include some details from the resource below: What is Family Sharing? - Apple Support
Everyone's personal files and preferences stay private
When you share iCloud+, family members can't see each others’ photos, files, or documents. And when you share other subscriptions like Apple Music, Apple Fitness+, or Apple TV+, each person sees their own preferences and recommendations — not the whole family’s.
Want to keep purchases private? You can hide individual items.
As an alternative, you can share passwords and passkeys via AirDrop if there are specific account logins that you'd like to share. For assistance with that, check out the following resource for more details. We'll include the steps below for easier finding: Share passkeys and passwords securely with AirDrop on iPhone - Apple Support
Send a passkey or password
To share with someone on iPhone or iPad, ask them to open Control Center and allow AirDrop to receive items. To share with someone on a Mac, ask them to allow themselves to be discovered in AirDrop in the Finder.
1. On your iPhone, go to Settings 
> Passwords.
2. Tap the account you want to share.
3. Tap 
, then select the device or picture of the person you want to send the passkey or password to.
We hope that's able to help.
Have a great day!
