Jamie had walked in behind the group, he heard his sister saying that Joffery was not his son. He knew that she was only trying to protect her position, but he knew now that the truth was out, there was no point in denying it. Even if it wasn't, there now was doubt that Joffery wasn't Robert's. He walked through the crowd, and when he got sight of the commotion; he seen that Joffery had a sword at his throat.
"There is no point in lying now, Cersei. Joffery, and his two younger siblings are mine. I sired them, she made Robert believe they were his." Said Jamie.
"How could you make up such a lie about them." Said Cersei.
"I'm not lying, and I will support my brother. I'm just hoping that he can forgive me for all that I have done to him since we were children." Said Jamie.
"I do brother, will you serve as my hand of the king?" Tyrion asked.
"I would be honored, brother." Said Jamie.
One of the guards came over, and guided him away from the crowd. Cersei was so angry, she wanted to kill him. Margery was shocked, and horrified at what was just confessed. She looked to her family, and they looked just as horrified. Joffery had then grabbed the end of the sword, and pulled it away from his throat. He then took his dagger, and went to stab Jamie in the back, but before he could even get close enough to harm him, one of the guards stopped him.
"You don't know what you are doing you little brat." Said Lana.
"I am going to take my throne back." Said Joffery.
"It's lost to you now. You have no queen; I believe that the young woman's family will deny the marriage to you." Said Lana.
Joffery had looked towards Margaery, and her family. They were looking at every place, except where he was. He looked back at Lana, and grew very angry.
"I will end you some day." Said Joffery.
"I don't think you have any means to make good on that threat." Said Lana.
"If you like, I can have put into the dungeon." Said Tyrion.
"No, don't worry about him. My clan has dealt with many like him before, and we have survived." Said Lana.
Lana then bowed to the king, then to the queen, and then turned to leave.