Yeah. It seemed like when someone has amnesia and you try to trigger them back into their previous self, kinda like how in the show the gay guy who got turned into robot in the sewer, and his boyfriend successfully reawakens the old him
I don't know what happens after this, I haven't read the comics yet.
I get what you are saying though. Even though everything that Omniman has done, he still loves him cause of the past and cause he's his dad. They just got done trying to kill eachother but they still remember the past. The moment when he chooses not to kill his son hit hard, because it showed he has some empathy and on some level regrets his actions, even though he is a psychopathic killer.