Why did Brenda go back

because she is an idiot.

something about her son.

She was having one of those senior moments I've heard about,sad as it is she's nowhere near that old!

She was dumb. She went back to make sure they would not go after her cousin Victor (who they knew owned the vehicle they were driving) but added that her son was with him. They did not know about her son so they knew they could use that against her and just took her right back in.

You killed my father. Prepare to die.

At the start it was a good story.
But the writers messed up the last few episodes.
I never, never in my whole live have seen this stupidity idiots people like Brenda.
Also Teresa. I thought she was smart with experience.
But the story at the end is unlogical and I don't want to see it anymore. I am very disappointed.