Wild video footage showed María Alfaro stepping out of a vehicle to confront the group outside her residence in Chalco on Monday.

Alfaro arrived with an armed man and woman when a gun shot was fired in their vicinity.

The granny took several steps toward her multi-story property and exchanged words with one of the alleged gang members while her armed family member made his way inside the home.

One of the fatal victims, Madaleno Marquéz, 51, could be her asked Alfaro, 'What did I do to you?' when she suddenly shot him.

María, 51, then aimed her firearm at Marquéz's daughter-in-law, who was recording the incident, and proceeded to shoot his 19-year-old son, Justin Marquéz.

Madaleno and several other people then chased María and her family to the street, where a wild melee erupted before the one of the Alfaros shot a 14-year-old boy.

Justin was pronounced dead on the scene, and Madaleno was rushed to a nearby hospital, where he later died. The unnamed 14-year-old is recovering from the wound.

María, her children, Mariana, 51, and Eduardo, 34, fled in a vehicle but were arrested Wednesday. 

They are being investigated on double murder and attempted murder charges.

Another man named Julian Alcantara, 30, has also been arrested.

María's other son, Arturo, did not participate in the deadly incident, is a former politician.

According to local outlets, María had approached local police and asked them to remove the squatting family from her premises.

However, Marquéz's family argued that they had legally rented the home online.