Your family sounds based. Even if 50% of Tor nodes were run by the same organization, and even if that organization attempted to deanonymize them, that would still result in only 13% of 3 hop Tor circuits allowing users to be deanonymized. If you are really worried then your push should be to increase the number of hops in Tor circuits. Trying to identify and exclude nodes you think might be malicious is completely misunderstanding how Tor provides anonymity to its users. What grows faster? 2^x or x^2? But I have yet to see convincing evidence that ANYONE is capable of tracing Tor circuits, especially with the most up to date version of the software. I would like to hear where you are getting your information from, if you don't kind sharing. I don't have time to say more.