Is it normal that i want to pot my mother-in-law to social security department?

Unbelievable but true. I met my mother-in-law 14 years ago, and, six years ago got together with her son. When we got together, he told me that she had him when she was 14, wrapped him up in newspaper and dumped him in the vege garden.16 months after this, she had another child, who she bought up with a gold teaspoon in her mouth. He never met his mother until he was 29. He then shifted in with her for a period of 10 years, and while there, paid for a brand new heatpump, put new carpet through her whole house, and paid for a new deck in her backyard, amongst other things. We got into a bit of strife over a bad business decision, and, after a lot of begging and pleading, she finally loaned us $10,000 to bail us out. We have got a deal to pay interest only for 12 months (which we are paying religiously) She is now demanding the whole lot back in one go, saying that if we dont, she will take us to court and send her own son bankrupt. We had a four day holiday a couple of months ago, and she went berserk, sending abusive text messages, saying that maybe if we paid her what we owe, she could have a holiday. We work bloody hard 6 days a week, and dont usually get a break at all. And, this is the irony: She has been on a benefit for the last 14 years, and since my husband moved out to live with me, she has had two long-term relationships, claiming at the social security office that they are only boarders. She has also committed fraud by having her name spelt different on her passport to how it is spelt on her birth certificate, so she can swan in and out of the country as often as she likes, and her benefit doesnt stop, like it normally would. In the last 18 months, she has been to the USA, Fiji, and been on two 12 day cruises. And yet she makes our life a misery because we had a four day holiday 6 hours down the road. She also has an aunty that is in a dementia ward and she is hoeing her way through her money like there is no tomorrow. If she had bought her son up, it would have cost her a lot more that $10,000 to bring him up, and she would never have got it repaid. She is such a gold digger, and gets money from everywhere that she should not be getting, and often is not entitled to. She still owes her ex-husband $10,000 for 12 years ago, and yet as far as she is concerned, that is not important. I am so pissed off at her, I would love to pot her to the social security office. It would probably result in her losing her house, and she would end up in jail. It is only family loyalty that stops me.