<human>: Can you give me a shortened version of the text?

Throwaway account for obvious reasons, sorry. My mother (K) married an illegal immigrant (M) 14 years ago. For awhile, M was living and working in the US off of an assumed identity and another person's SSN. K has spent a ton of money to try and get M legal and each time they have been denied. The response was that M needs to return to Mexico, wait two years, and ask for a Visa. M absolutely does not want to return to Mexico.

Last year, M's sister was granted a hardship visa, so M decided that he could get one too. K is sick and they have submitted, and been denied, a hardship as K has too much of an income to be considered dependent. Now they want to press the issue with a lawyer. 

The problem is that M doesn't take care of her and everyone (neighbors, family, strangers) knows this. He does absolutely nothing for K. M illegally works and keeps all the money to himself. He doesn't pay the bills, doesn't take K to her doctor's appointments, doesn't help her around the house. Nothing. He has a girlfriend on the side that he brags about. Everything they are saying on the hardship application is a lie.

Now, while K has made her own bed, I worry about an investigation. No one in our family will testify for M in fear that they will lose their benefits or get in trouble for defrauding the government. Their neighbors know M has a girlfriend, a job, and is never home. And all someone would have to do is watch the house for a few hours to see that M is not around. K is insistent that the only one who has something to lose out of this is M and that she is legally safe.

My question is what kind of trouble can K get in? At this point, I'm afraid for her as she cannot work and is ill. If she loses her VA or SS benefits, she loses everything and M will, most likely, not support her. Thank you so much for anyone that actually reads all of this mess.
<bot>: Mother is applying for a hardship visa for her illegally working husband and lying about her depending on him. Everyone knows. Can she lose her VA, SS, and other benefits?