Yes if she lived with him all year and made less than $4,400 he can claim her as an Other Dependent. Don't know why it thinks she is a spouse. Don't pick married or Joint. He is still Single.
Who can I claim as a dependent?
https://ttlc.intuit.com/community/credits-and-deductions/help/who-can-i-claim-as-my-dependent/00/267...
