Honestly, I think Hook might try to persuade Bae against Rumple. He is still Millah’s son, and Hook’s comment “What makes you think his son wants to be found? Do that boy a favor” implies that he doesn’t have any hate for him. Hook would of course tell Bae how Rumple killed his mother. Even if Millah abandoned him, I doubt Bae would forgive his own father killing his own mother. Belle might have been willing to forgive Rumple for his past actions, but it’s much more complicated for Bae.