The “Nuclear” option is to apply to have a strata manager appointed however, that is one of those “be careful what you wish for” situations. You would want to go in with a manager you trusted and who is willing to do the job. The nightmare scenario would be if the family turned up with a “neutral” manager who only did what they wanted anyway.
You could try to get orders that the owners increase the size of the committee and elect you to it but I have never heard of that happening.
My best thought is that you contact our sponsors Strata Answers who will, (for a fee) advise you on your best course of action and may even represent you to the other owners or at a tribunal, if appropriate.