"It is joyful to share the dais with OPS after a period of separation," said the Chief Minister, who was a minister seven months ago in the cabinet of O Pannerselvam, then Chief Minister. OPS declared that the Chief Minister and he "are sons of same mother. We should make any sacrifice to safeguard Amma's legacy".
The call for unity -- at a function to celebrate the birth centenary of party founder MG Ramachandran -- came amid a rebellion by 19 legislators of the AIADMK who have demanded that Mr Palaniswami must quit. They accuse him of betrayal for moving to expel party chief VK Sasikala and her nephew and deputy TTV Dhinakaran as part of his merger agreement with O Panneerselvam. If EPS has to face a trust vote - already suggested by opposition leader MK Stalin of the DMK - he could be in trouble.
The united AIADMK has 134 legislators in the 234-member house - just 16 more than the 118 needed for majority. A rebellion by 19 Sasikala supporters will take Mr Palaniswami's numbers well below the half-way mark.
Mr Panneerselvam, though, declared today that the government is safe. A couple of tweets from him this morning read, "No one has the power to topple this government," and the "AIADMK government will stand rigid for years".