My texts are going to my husband's iPad. How can I prevent that?

One solution:

Go to your husband's iPad settings, click on the owner's name at the top left, then sign out of that Apple ID

If you create or sign in to a different Apple ID, you shouldn't have that problem anymore

Alternately, you could go through the same operation on your other Apple device

It sounds like the devices are using the same Apple ID. Each user should have their own.