Good points Ranu and Shubba Akka.
Like Shubba Akka said, even if Aanandh now told his friends about his anger at TA, i think he is going to make either Joseph or Kanagu or even Ashok (who is not shown often lately) to go against TA and Thulasi. Most propably, that is why the key being kept in the meterbox and MM seeing and getting unsatisfied about it, but still is not that much possible as both of them are very good characters and they are like TA's own family members, but Aanandh is capable of making them TA's enemies.
Even if J&K should inform TA about Aanandh's vengeful mind, he won't really believe them or he won't give enough attention to their warning about him, but if Kanagu tells this Thulasi, she would be more aware. I really hope that neither of the three friends of TA does not go against him, but in this serial we can never know when someone is gonna turn good or bad. I wish they maintain their friendship like now and don't ruin it.