Can someone please explain the ending of the last chapter he was arguing and pushing him a...

i literally can not follow this story either, its so messy so im just assuming theyre working together to kill the gandpa and also convince him hes gonna have an heir since thats all he wants

idk man im pulling this outta my ass lmao

I think the doctor working with the mother but it still doesn’t explain why they’re smiling in front of the reporters when they were just fighting?

Because it's reporters. He's telling him "nobody cares about the truth, your job is to sell a dream so act like an effin idol and smile". They can be themselves "offscreen" but wear an fake alpha/omega mask in front of the crowd.