What did each Trent really think about Benjamin defecting? Did they all think that Jill was controlling him?

emeralddodge:

Janice firmly believed that Jill was controlling her son. She loved Benjamin to the point of blindness.

Beau has almost zero emotional intelligence, so he assumed that Benjamin hung around Jill for sex. It made sense, from a logical perspective–Jill is Ben’s type, and they were living together. 

For the brief amount of time that Henry had to think about it, he was the closest to the truth: Benjamin was acting out on long-time frustrations and unhappiness. Henry never knew the depths of Benjamin’s inner turmoil, but he knew that his youngest child had never quite fit in with the rest of the family. That said, Benjamin’s departure wasn’t a surprise, but his joining a superhero team was. Even Henry didn’t expect Benjamin to be so bold.

Only Eleanor sensed that Benjamin was falling in love with Jill, and while she wasn’t a fan of superheroes, she acknowledged Benjamin’s autonomy in the situation. At the end of the day, Eleanor just wants her baby brother to be happy.