multiple accounts after spouse passes
Apps that we shared are no longer available- don’t know the password on spouse account
What do you mean by "no longer available"?
What exactly can't you do?
Can you not access apps installed on your device?
Can you not see apps they purchases in family sharing?
Did you exit or disband the family sharing group?
What exactly happened?
Its important to be clear about what you cannot do anymore or what exactly happened.
The passing of a person does not automatically disable their account any Family sharing group unless you manually did something, like removing their Apple ID from the family group or leaving the family group yourself.
You need to explain exactly what happened to cause the apps to not be available, and how they are not available.
To start with you may need to request access to the spouse's Apple ID:
click here ➜ How to request access to a deceased family member's Apple account - Apple Support