I plan on not telling my son about his uncles.
Why do you want to keep your son from knowing about his uncles?
I want to keep the peace in my family. I can't deal with his father's shit
Even though you do not like dealing with your son's father, you should not lie to your son. You should tell him the truth about his uncles existing.
I'll take the heat. I'll tell my son when I'm ready.
I can understand how you are trying to protect your son, but you shouldn't lie to your family. If he brings it up, you should be honest with him and tell him the truth. You don't want someone else to find out the truth.