@crinrictThe reason it doesn't always work is because of another outcome: "if target no mermaid -> fail", and with multiple valid outcomes one is picked at random.
Overall there are three potential outcomes
1) fail if no mermaid (target)
2) fail if mermaid (target) and relationship<70
3) success if a) mermaid (target) and rel 70+ or
b) merfolk woke trait (target)
in our case both 1 and 3b apply
On XB1 my merfolk woken target (a vampire!) "admitted" being a mermaid after 5 tries.
btw, why is there a merfolk woke (target) check in the first place? No other file has similar code snippet
