OK - yo're not gonna like this...You were working full time, when you had primary care of kids. BUT when your care got reduced you also reduced your work...Surely, if you are no longer primary carer you would have more time to work? Not less.... So they have you on capacity to work.
So her son is the sole beneficiary of her business? But he is a school aged child? You don't work full time because you look after step-son? but he is a school aged child? So you're not exactly looking after him 24/7? And why is a child the sole benefactor of a business?
Ok the whole business / trusts stuff is a mystery to me. I'm a simple payg wage slave with zero ability to hide / scam etc etc....
But, frankly, I smell a rat... Maybe the increased your payments because there is evidence that you're trying to reduce your payments...
Yup - they area law onto themselves. But I wonder if it might be the case that when they find someone scamming they elevate payments well beyond what is fair just because they can and as a warning to you not to try and pull the wool over their eyes again...