Yes, tackle him but not obviously. Since he wants to kill his wife, take said wife away from him for a while.Let him experience how life would be when she's not around anymore. The next time they fight like that, pretend to help each cool off by taking your mom home with you. Pls take her and don't return her until he misses her so. When he request for her return, let her continue to form busy without any animosity. In fact, if its my mom, he would eventually apply for visitation visas before he sees her again. Which kind local champion he dey form...I no go look him face!

DLondonboiy:
Oga, don't disturb yourself.

If there is anything I've learnt in my few years on earth is that women love to be beating..
If you dare interupt ya dad while he is beating ya mom..ya dad won't curse you..ya mom will..

Women love men that beat them...Forget all those cry and running around....they love it!!

Unfortunately, a woman will marry this person

Pidggin:

Unfortunately, a woman will marry this person

will u marry me?

Tell her to behave like a wife and not a chick
Tell her to be quiet and see positive results
Tell her if she continues, you would ban them from visiting your home.
just try and bring them together with carefully chosen words.

You are a man don't go against your dad or you will send him to early grave, some women like it and when you don't do that they will do more things that will annoy to and is you still don't do anything that is the time they will tell you in your face that you are not a man

I appreciate the intelligent replies given here. However, there are psychological reasons behind this shameful act, that needs to be unearthed and treated.