Do you know if your parents pensions are for their joint lives, or single? If not joint, then they also need to be prepared for the income shock when your father passes and his pension ends. That could be a very good reason to address the debts now.
An emergency fund is a very good idea. They are homeowners; what is the condition of their house? How old is the roof, and the major mechanical items? That's another thing to be prepared for, or that might spur a discussion about downsizing.
If they really have nothing, then you might want to study up on their state's Medicaid program and qualification. It's not pleasant, but It's even less pleasant when done in real time, as the need occurs. The general guidance on LTC insurance is that it's applicable for wealth between $500k and $2.5M. Above that, you can effectively self-insure. Below that, and either the premiums or the care would eat up everything. (I just use this as an example. With their age and your father's condition, you probably wouldn't find any kind of acceptable LTC coverage)
My Mom went through a school of hard knocks learning on this with her sister, then with my stepdad.