A lot of inaccuracies in this thread…
1. yes ODSP is social assistance
2. social assistance in Ontario is given out to households, not to individuals. There’s no such thing as a married couple living together in which only one of the two is on social assistance: they either both are or neither is.
3. the federal government does keep track of the “excess” amount that any household—in which a member is being sponsored—is receiving each month. If the sponsor’s disability is temporary and they leave the ODSP program, the federal govt could ask them to pay it back, but if the person’s disability is lifelong and they stay on social assistance, the federal government cannot actually ask you to pay it back unless you try to start another sponsorship (at any time in the future, even decades later).