That is still the spousal SS benefits, not the dependents benefits. If they kick the boy out, and have no other dependents then the spouse loses her SS benefits.
When he tried to obtain a Medicaid card, Gideon Barlow learned that his 73-year-old father was drawing Social Security funds in Gideons name. Social Security allows retirement-age parents to collect money to help support children ages 16 or younger who are living at home.
I have no idea if any of Dan Barlow's spouses receive social security benefits, either on their own work record or on Dan's.