Where can I get financial assistance for monthly expenses?

Depending on where you and your parent live and your financial situation, there are federal and state programs that can help. The best place to start is with your county's See also:
What is the difference between power of attorney and conservatorship? Office of Senior Services. They can give you advice on how to find services that provide:

• Income assistance (for example, Supplemental Security Income, or SSI)
• Food stamps
• Property tax relief
• Utility and telephone assistance
• Prescription assistance
• Other miscellaneous financial assistance, like home repair

If your parent is a veteran, contact your county's Veterans Service Officer, who can provide you with information about health care and other benefits available to veterans. If your parent needs help reducing their debt, contact a nonprofit credit counseling service such as Consumer Credit Counseling Service (CCCS.) They offer free credit counseling and a nonprofit debt management program.