Does self-defense apply to me and defense of my son apply for the amount of force used?

I was assaulted by a 16-year old with a knife on my property three times. I was struck with the knife in my right wrist and arm. The 16-year old attempted to lunge around me and strike my six-year old with the knife. I open handed back slapped him to the ground and told him not to move until the police arrived. Out of bushes came the 16-year Old’s uncle threatening to kill me with a hammer in his hand, waving it and cursing at me while moving towards me and my son. At the same moment, the boyfriend of the 16-year Old’s mother (convicted child molester on lifetime sex offenders registry) comes to the side of the uncle threatening me with a tire iron, cursing and threatening to kill me also. I am legally licensed to carry a handgun. As the two grown men approached, I lifted up my shirt and told both not to come any closer. They kept proceeding towards me and my son. I upholstered the weapon and told them not to come any closer at which point they stopped. The 16-year old was never touched or threatened after being placed on the ground. I was charged with Class B felony (Criminal confinement), Class D felony (pointing a firearm) and Class A misdemeanor (Battery). I was not asked by any officer if I was injured or was ok. I was taken straight to jail, the other three were told to go home by the arresting officer because he smelled alcohol on their breath and would take their statement the next day. I was interviewed seven days later in the jailhouse and am still being charged with said offenses.