When you started the return, did you choose to prepare only his return? Because if you have chosen to prepare the return for "My spouse/partner and me" then it will ask you all the questions for both of you.
To change this, you would need to start a new return, and select either "Myself" or "Someone Else" when asked who you are preparing the return for.
To start a new return, select “Start a New Return” from under “My Returns” in the top left corner. Once you have started your new return, you can select “View All Returns” from under “My Accounts & Returns”. Then delete the unwanted return by clicking the small Trash Can next to it or “Delete” under the return’s name.
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