To untangle this fight between girlfriends in northwest Atlanta, you'll need a family tree. And the cops. When the argument between these two lesbians turns into a fight, the mother of one steps in. Not to soothe bruised feelings but to stab her daughter's partner. Nice, mom.

The girlfriends got to arguing late on a recent Thursday night. But rather than help the ladies talk through their differences, the mother of one picked up a knife and stabbed the partner of her daughter in the right shoulder and left hand. We've heard of a big sister helping her bullied gay bother kick a little ass. But a family member taking up weapons is a bit over the top.

Unless you're that Fulton County lady who convinced her son to help murder her former girlfriend by stabbing, beating and strangling her to death. Don't be that lady.

The victim's reaction in this recent domestic dustup? Call her mom, of course.

So mom No. 2 shows up, collects her daughter and takes her home. Then she calls 9-1-1 and an ambulance takes the injured daughter to Grady. The uninjured girlfriend returns to the apartment she shares with her mom, which apparently isn't far from the second floor apartment where her girlfriend was stabbed (and lives).

Police officers, surprisingly pleasant, politely knocked on the door of slasher mom's place. No one answered. Shocking, we know.

“We observed blood on the wall by the entrance to the second floor hallway where [the victim] lived,” according to an incident report filed with the Atlanta Police Department.

And then, with no witnesses nor suspect to arrest, the police wrapped up their investigation. “Nothing more to report,” the incident report says. Indeed.