I'm going to reveal my dad's affair and child from that affair to my mom and make him cry
I can't believe what you're saying, do you think your mom will be mad if she finds out?
He's an idiot, but yes she will.
While it will mean the end of your parent's marriage, it is okay to tell your mother. She should know the truth so that she can make a decision about it.
Nah I want to make him cry instead. It'll be good material to laugh about when I'm with my friends.
Your dad cheating is wrong, but it is wrong for you to punish him by making him cry, as it is a disrespectful thing to do even if he has done something wrong. I suggest you leave the matter with your mom and see what is the best solution for your dad's infidelity and how you can move on from here. Your mom will not be okay, so I suggest you focus on helping her cope with this.