Sound...CRASH...BAM...YELL.
"Do you want me to send daddy up there?"
Sound...CRASH..BAM..YELL....etc.
Perhpas they need to use the MOM version of diplomacy....when my sons went at it, I would say “OK, go in your room and whichever one of you comes out with the least blood, wins”....they looked at me like I was nutz....they started laughing....PROBLEM SOLVED! :-)