Damn right, Henry. Hook would NEVER hurt this family.
Even when the darkness was coursing through his veins and promised him a way to finally get the revenge that he had spent centuries pursuing and the cost was Emma’s family he still couldn’t do it. He had every Dark One there cheering him on but he fought with every bit of strength he could muster to not only save everyone from the fate that his previous weakness had condemned them to but to eradicate the Dark One forever. When faced with the choice of finally getting his vengeance and killing everyone or sacrificing himself, Killian chose to give up his own life to save everyone else.
So yeah, Henry knows first hand that Killian would never hurt this family.