This is good news for you and your family if both you and your spouse were born in an eligible country AND you and your spouse both meet the education OR work experience requirements, because this means that you can double your chances of being randomly selected as a winner by each submitting a separate application to the DV-Lottery.
For example, you can submit an application with yourself as the main applicant and include your spouse and all unmarried children under the age of 21 (if relevant) as “derivatives” on your application, plus your spouse can also submit a separate application as the main applicant and include you and all unmarried children under the age of 21 on his/her application as “derivatives” and then, if either you or your spouse is selected as a winner of the DV-Lottery, the other spouse and the children listed on the winning application will all have the opportunity to continue the U.S. immigration process!