Will I be held liable regarding an accidental injury that my son caused during a sword fight?

Question Details: I have a neighbor who is 20 years old and is in possesion of 2 samurai katana swords. My 17 year old son who lives with me, went to the neighbor's house. The 20 year old asked my son if he wanted to swordfight with 1 of the 2 katanas. My son said, "Sure". They were 10 minutes into the swordfight and his hand slipped and cut into the neighbor's left pinky finger, deep into the tendon. The neighbor got assistance with his hand at the emergency room and he has to go see a plastic surgeon this week to get the tendons fixed. I want to know if there will be any charges pressed against my son. The neighbor made it known that he willingly allowed my son to play with the katana and swordfight. The neighbor made it clear he was responsible. Will the 20 year old neighbor sue me and my son? Can charges be filed on both of us?

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