Hello Northern Star! And welcome to this forum.
It looks like we are living in neighboring countries. 40 years ago I started to study with the JW. At the time I was totally ignorant in religious matters (and Philosophical questions) , so I became a JW. Even un elder by the time. I always had my doubts and a lot of unsatisfied/unanswered questions. 20 years ago a started to fade, and got a new chance to study. I started my studies in a university. My subjects were History of Ideas and science, History, and Theoretical Philosophy.
Today I am a total convinced atheist…… But I still have one family member who is “in” the cult. This is why I can understand you confusion about the two witnesses and their obvious “cognitive dissonance “. They will not or cannot tell you all facts at once. Some of them does not even know themselves what the soc. want them to say. The most important for them is to continue their “study hours”, so that the will remain in good standing within their congregation.
I think you have a good opportunity to wake them up, asking questions on the subject about The flood, ancient tribes, how long have humans existed on earth, the nature of their cruel God…a.s.v.
Good luck
Bugbear