Can you talk to the other owners? I suggest you foreshadow your concern exactly as you did here. IE ask them in advance to stick with the meeting to get the business finished and to support you in your role as chair.
There are formal procedural motions that can be put by anyone to regulate a meeting. By putting such motions, the others would be saying in a cool, calm, formal way that they support you in imposing an orderly meeting structure.
Another thing would be for you to announce a time limit on speaking for or against any motion and to take speakers for and against in turn. After a couple of rounds of back and forth you could say that you will only take any further comments before the vote if a person who has not spoken wishes to make a point that has not already been made.
If people are interrupting or talking over anyone else, stop the speaker, ask the interrupter to desist and very clearly start the clock from the beginning again for the person who was interrupted.
With luck they will get the message. Bullies are often not used to people standing up to them and sometimes fold surprisingly easily when their victims start to show a little less timidity.