Get help with paying bills or free stuff.

My mom is an 82 year old recent widower. Her husband left her with bills and now she is only living off her social security and isn't able to make ends meet. How can I find out what assistance she may qualify for?
She lives in Boynton Beach Florida with my sister who is unable to work.
I look forward to any help you can give me to get them in the right direction.

I just started a new job as a widower. I applied for an apartment due to my kids grandmother wanting us out of her house due to her wanting me to pay rent when the agreement was for me to pay only the bills at first. I can't afford it so I was approved for my apartment but I don't have the 425.00 for the deposit or the prorated rent 131.50 and also I don't have the 250 for my electric bill deposit. Also I owe 326.00 gas bill and I don't get paid until Friday and I have to pay the bills where I am to keep piece and I really want to move by Friday.