Hi Zoe,
It's possible that others in your family also have desires to escape from CoS as well, but they've suppressed these thoughts for the same reason as you. They don't wish to endanger familial relationships.
One thing I might do if I were in your shoes would be to get a trusted friend (who's not involved with Co$) to anonymously send a group of people, including you and your entire family, some materials which could hopefully spark a conversation amongst you, or may even create new doubts in the minds of the others.
This could be a number of different things such as content from celebrities who have exited CoS, the infamous email from Debbie Cook, Doubt Formula's that some prominent Scientologists have posted on the internet where they showed how the CoS is corrupt and grossly in violation of LRH policy.
While I personally would
never get involved with Scientology either IN or OUT of the CoS, you can also anonymously send them info letting them know that Scientology IS available outside the CoS with some highly trained auditors. They could receive services for less money and less of the insanity that comes with CoS.
Many who have chosen this option eventually stopped any involvement with Scientology, but it helped them to feel that the "Bridge" was there outside CoS for them to make their escape. It was a stepping stone that some needed or felt that they needed.