Purchased Apps are forever tied to the AppleID account from which they are purchased. To download or update an App, you must be signed-in to the Apple App Store with the correct AppleID. Presumably you have stopped using your original AppleID account - and have since used a different account with your iPad.
The best way to return to using the correct AppleID is to prepare the device as you would before giving away the device - as this ensures that you have properly reset the device and removed the Activation Lock associated with the current AppleID:
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
After doing so, you can setup the device as a new device - using the correct AppleID.
An AppleID account (now known as your Apple Account) is intended to be used for life - one Apple Account for all of your personal devices. Your AppleID is the account to which all your devices are associated - and all App, iCloud, Media and Subscribed Apple services are linked. Using the same AppleID allows you to pay-once - and share your Apps and subscriptions between all your devices.
Every User should have their own unique AppleID. What you shouldn't do is share a single AppleID between Users - such as between yourself and your husband. Should you wish to share purchased Apps and Apple Services/Subscriptions, you can do so using Apple's Family Sharing feature:
Family Sharing - Apple
Set up Family Sharing – Apple Support
Share App Store, iTunes Store and Apple Books purchases with Family Sharing – Apple Support
https://www.imore.com/how-set-up-family-sharing-iphone-ipad
