Thanks everyone. I'll follow up on your suggestions.
Pace, we're actually Canadian and NOT generally known as a litigous society, or however you described it. My father served his country doing a risky job for many years, and if doing so made him sick, then maybe he's entitled to a little assistance. I've got no plans to launch a class action suit; I just want him and my mom to get the help they need to stay in their home a little longer.