Hi Centaurus A, welcome I hope your journey in life gets easier as you go on.
If you aren't worried about being disfellowshipped/shunned by relatives, say and do whatever you feel is right.
On the other hand, if you want to help your dad, you can only do so as long as you are careful with what you say and how you say it. Present ideas to him as questions, not as facts or (justifiable) criticisms. Get him thinking.
You have a PM with some topics to consider for use as questions.
Best wishes for your future.