After all, the so-called officiant of the wedding should look for her father Nereus, not her brother-in-law Poseidon.
Even though Poseidon is the Sea King, theoretically governing all deities of the sea, his jurisdiction has little to do with her marriage.
However, none of that matters.
As long as they can successfully muddy the waters and get the brothers above to start fighting, their own safety will be greatly improved.
If it had been before, Thetis might have hesitated over whether such actions were unethical.
But after the pursuit from Peleus and her unanswered pleas, she had completely awoken to reality.
Better to abandon allies than perish oneself; better look after oneself first.
"Head south, 800 kilometers, there is a new Sea God Temple built by survivors of Atlantis in that sea area,"
"Understood!"