We have a middle-aged owner who is accompanied by her irascible father at both general and strata committee meetings. The owner is a member of the strata committee but the father is neither an owner nor a resident, nor a proxy holder nor committee member. Both dominate and bully the other owners, with the father lately doing most of the talking.
Someone needs to have a word with the strata manager and the first thing they should be told is that the committee has to vote on whether non-members are allowed to speak at the meeting. That is the law as spelled out in section 13 of Schedule 2 of the Act (and it’s up to you to persuade the other committee members to vote no).
Then you could put a motion to the committee instructing the strata manager to instruct tradespeople that they are only to deal with them (the strata manager) or a nominated member of the committee (the secretary or chair). Tradespeople should be told clearly that taking instructions from any other owners will be a breach of their contract and could see them lose the work.
You might also look at proposing Standing Orders or a Code of Coduct to be adopted as a by-law at your next AGM. You’ll find some thoughts on that HERE.