You are in a tough situation, BU2B. Without giving yourself away, could you point out a few of the times WT has told followers they will not grow old in this system? Let them know how important you feel it is for them to try and make a secure financial position for themselves, as they are obviously ageing in this system. For practical purposes. Do not say anything anti wt right now. Use the over-lapping generation thing to your advantage, cause if I understand it, it could be another 50-100 years, correct?
It is time for you to start networking for them. Bring them into it, talk to anyone & everyone who might know where your Dad could find employment, and your Mom as well. There are people who support their families doing her type of work.Gently let her know that it's time for her to help your Dad now. Where is that scripture about the capable wife? Your Dad may have to make a career change, maybe you could help him to explore options?
It might take some time, but I'm sure they could both find employment. And you have to ignore the hints of moving in. Gently helping them find work may get the point across. All the best to you, and I hope your parents find work soon. This must be hard emotionally on them as well.