The problem is, from the beginning I do not have any of those symptom.
No cough, fever, night sweats, and my Sputum AFB is negative.
The only thing is confirmed is I lost weight that's it.

Which is why if they base on those clinical ways, I don't see how is it going to help in my case you see.

Thank for you ur reply.  So if the person's body managed to contain the bacteria that person is not infectious? What if that person suddenly starts coughing, will it be infectious? Usually when a person cough they usually brush it off as normal coughing.  Will tb spread through sharing of drinks or food?

I have people continuously being exposed to the patient who is tb positive. The patient is also having lung cancer and she is 80 yrs old hence she requires people to take care of her all the time.  Having her putting on a mask will create great discomfort for such an old lady.  And worse, she is unable to take her tb meds because her intestine could not handle such heavy dosage of meds daily.  She has Ben vomiting all the meds out Everytime she takes them.

Will her caretakers eventually be infected with tb once their immune system drops?

Now that's worse. If some kind of drugs managed to get into the system (without the full dosage), the TB will develop into multiple/extreme drug resistant strain which needs longer term antibiotics (1-2 years) with more severe side effects.

They can wear N95 mask to protect themselves. It's possible if  no protection is worn. A normal mask (white side outside) offers only 40% protection. Can wear double or triple mask but no evidence shows how effective wearing multiple layers.

Again they can get infected but if body cannot contain the infection, a person gets TB. If TB is contained, the person is not infectious until it reactivate. So again, it comes back to the immune system.

Precautions can be taken other than mask. Buy the single gas burner/induction cooker/slow cooker, slowly simmer the following :
Cinnamon sticks (better if you can blend into powder)
Rosemary herbs
Serai
Pine leaves (make sure it have the fresh pine scent when you break them)

Replace them regularly like every 3 hours or else not effective in decontaminitaing the air.
The above is a crude DIY essential oil air decontaminator.
Best is if you can get 100% pure essential oil to disperse into the air.

TB is airborne, and spread through air which makes it hard to control.  It don't spread through food.