If in Underworld, Milah shows up +Hook

how will they explain that she's Bae/Neal's mother, and she was sleeping with Hook for a while, and now Hook is sleeping with Emma, who has slept with Bae/Neal enough to make a child?

How would Milah react to knowing Hook's unfinished business is to exact revenge of her death, on Rumplestiltskin? And refuse to do it now that he is a hero?

Will Milah used the time they have to show Emma who Hook is during the time they were together on the JR, sailing under the pirate captain title? Plundering ships and murdering crews to get treasures? Kidnapping kids as young as Henry?