How Would You Deal With This Situation?

My Brother And My Son's Father Got Into It Because My Son's Father Was Coming To See His Son Early In The Morning Before Work, I Didn't See A Problem But My Brother Felt Like He Should Come At A Better Time, My Brother Burst Into My Room That Morning And I Asked Him To Knock First Before Entering, We Had A Few Words But No Argument, I Left The Room And My Son's Father Over Heard My Brother Saying How He Felt, My Son's Father Told Him To Calm Down And Be Cool, My Brother Lost It And Wanted To Fight My Son's Father, My Son's Father Stormed Out My House And Came Back Like 15 Minutes Later With A Gun Saying My Brother Said He Was Gonna Kill Him When He Didn't, He Pulled The Gun On Him And I Got Between Them Begging Him Not To Shoot And He Didn't.. My Brother Says I Took My Son's Father's Side And My Son's Father Said The Same Bout Me So Now I'm Stuck In The Middle, Later That Day My Son's Father Called And Said He Was Sorry And Didn't Mean To Go That Far And Told Me To Tell My Brother He Didn't Want Any Problems And He Apologized To Him Through Me, I Told My Brother What He Said And He Said Ok, A Week Later It Was Over But My Son's Father Still Wants to Come By And See His Son, I Told Him That He Can See His Son Anytime He Wants Just Not At My House But He Feels Even Though That Happen He Should Still Be Able To Come By, I Told Him That's Not An Option, I Even Went So Far As To Say If My Brother Is Not Home And I Know He Won't Be For A While Then It Could Be Ok To Come By But I Don't Want Them To Run Into Each Other, What Would You Do??