Amy wondered if her father knew about her mother's secret. Amy suspected he did not - not the way Jane reacted to being caught by Amy. That was quite a feat to hide being a mermaid from a husband of nearly two decades and the father of her 4 children. Amy decided her father should know.
Over the next few days, Amy paid careful attention to her mom's schedule so she could predict when her mom would be in the bathtub. Then she made careful arrangements, secretly taking her mom's phone and sending a text message to her father (then deleting them afterwards so her mom didn't know) to encourage him to come home early for some special time together.
Amy met her dad at the door.
"Oh, hi, Amy. I thought you were out."
"I'm just leaving. Mom wanted me to go out for awhile, but before I did to tell you she's waiting for you in the bathtub."
Amy hurried out the door. Her dad thought something seemed a little odd as he went into the master bedroom, closing and locking the door behind him, and then to the bathroom. Since he thought Jane was expecting him, he went right in.
Then he saw her: Jane resting in the bathtub and a fishtail sticking out the other end of the tub.