Hi, Depressedbrother, welcome to PsychCentral (PC).

I think I would make a plan, how much money you have/can afford to give your brother and what you would like in return for your money? Sounds like he is using you, whether he is ill or not; if he wants help from you he needs to come up with some answer/reassurances you aren't being played?

If you are paying his rent, I would not give him "extra" money and would remind him that threatening suicide is an ugly response to your help; you cannot do anything about what he thinks or "does" and you only have X dollars you can afford to lend him without endangering your own retirement.

Tell him that and be matter-of-fact about his threats of suicide; tell him you only have X dollars you can lend him and threatening suicide, when you cannot help him in that area and when he won't even give you any indication he is getting help, makes you think you might be wasting your money? Let him know you are powerless to "stop" his killing himself if he decides to and that threat is "meaningless" because of your helplessness to do anything about his illness so you would appreciate it if he didn't threaten you, yet you care about/love him but he needs to get official help and start getting back on his feet, apply for SSI or other formal help as his caregivers might suggest as you are retiring soon and need your money yourself.