Take a look at your home-owner's policy. The home-owner's policy should have the name of the person that is on the deed to the house. You state that you and your husband are included on the deed to the house that you currently live in. The fact is that all parties on the deed are covered. However, the majority of coverage will go to the primary names on the deed. The primary person on the deed is the one that puts in the claim, if something should happen to the home. This should include any type of damages to the house structure, bodily injuries, and personal belongings.
Here is an example; Your twenty something son returns home after graduating from college. He plans to remain in the house, until he finds a job. He is not paying rent to his parents. Is he covered under the policy? Generally, all the occupants in the house that are related to the primary person on the deed are covered. Therefore, you should not have to purchase renter's insurance. Of course, all insurance policies tend to vary. Therefore, it is a good idea to take a close look at your policy, and talk it over with your insurance agent or insurance company, for more details.