What would you do if you were a 45 year old woman and your 59 year old husband and 13 year old son kept fighting non-stop 24/7?

I'm asking this for a friend of my mom's, that's why the situation described in the title is so oddly specific with the ages and everything.

The son is in middle school and the very second he comes home he and his father begin to fight almost immediately. And over literally everything. Sometimes over nothing.

The son is admittedly pretty bratty (though not THAT much worse than the average kid his age) but the husband also has no maturity at all for a 59 year old. The fights are more or less 50/50 on both the husband's and son's end. They both like to provoke each other, sometimes the husband starts it, sometimes the son starts it.

Like an example. The husband steals a steak or something from the son's plate, they start to fight over it, physical fighting, ending up with both of them rolling on the floor, etc. Then later on the son sneaks up on the husband, pulls his pants down and farts on him, and they also start fighting.

And the fighting is every single day non-stop 24/7. It almost seems like they're gonna kill each other.

Meanwhile the woman starting working 3 jobs total because she couldn't stand to be home anymore with her husband and son constantly fighting. She much prefers to be at work than at home. She only comes home to sleep and that's it. She used to cook and clean but stopped and the husband and son have to do it themselves.

According to the woman her husband and son had a pretty alright relationship till the son turned 10. Then he turned bratty and stop listening to anyone and kept doing things he wasn't supposed to. And the husband had no maturity with this and began fighting with the son as if they were both the same age. And it only gradually got worse since age 10.

At this point she doesn't even go home for sleep. She sleeps at friend's houses. The house is filthy since the husband and son never clean.

So yeah. A really bad situation.

Not sure what I'd do if it were me. No clue.

Updates
9 mo
Similar to my reply to FateofOphelia, but what the hell... didn't 2 people leave a response before her, 1 man, 1 woman, and there should be 3 responses total instead of only hers? Like I even replied back to those 2 people and everything. Am I going crazy? Was that just a dream? Did they delete their responses at the same time? Did they block me at the same time? Just curious what could be going on here. It makes no sense. Either I'm going crazy or something happened. Anyway, thanks for reading.
What would you do if you were a 45 year old woman and your 59 year old husband and 13 year old son kept fighting non-stop 24/7?
Post Opinion