Bad Tenant

[Maurice Staples]

I have a question, I have a tenant who's wife got into an argument with the family next door. From what the tenant on the first floor told me this is not the first time that this has happened. The problem is they argue in front of my property which makes it bad for the whole block. I will approach her husband about this but what should I say to him about controlling his wife? Should I give them a warning that if it happens again they will have to leave?