The future can be uncertain. However, Social Security’s Advance Designation program can help put you in control of your benefits if a time comes when you need a representative payee to help manage your money.
Advance Designation enables you to identify up to three people, in priority order, whom you would like to serve as your potential representative payee.
The process for assignment is detailed in the link -
Plan for this just like you plan for other future possible things in your life - Your Power of Attorney and your Healthcare Directive or Living Will.