I'm not sure this is an option as they are older and already receiving social security benefits.

I’d be happy to help manage the budget and contribute where I can, but I am not confident that this will make any difference in their spending habits; they have already been meet with several significant financial crises over the years (unable to pay mortgage on time, major housing repairs, inability to afford medications) without any change. If these experiences haven't motivated them, I am afraid my input on a budget will be futile.