How do I help her understand

So my mom has two grown men living in her house, they are her sons. They work, but won’t buy food, clean up after they self, help with bills, they didn’t even shovel the snow when it snowed over the last couple days. She gad to do it herself she is 59. I just be feeling so bad how they just use and abuse. She had a water bill and electric bill that was sky high and they won’t help. She works full time and they just don’t understand she needs help with bills it’s like they enjoy seeing her struggling. They are so disrespectful the oldest doesn’t even speak to her won’t say hi or anything and it’s like you living here rent free you can at least take out the trash and pull the can to the front but they don’t. I don’t stay at home but I have went over there to pull the can to the front or clean up the yard. I’ve told them to help and they ignore me. How can nicely tell my mother that’s it’s time to make them help or leave it’s putting so much stress on worry on her. 🤷🏻‍♀️ or do I stay out of it