A family’s moral code is tested when an unhappily married woman must disappear with her estranged father after being mixed up in the death of a criminal to evade the vengeance of his brother.

Hi mobiuswest,
This is how I see the story based on your logline. You can use this logline as a template and re-write.

An unhappily married woman who gets unwillingly mixed up, coerced into, or forced to take part in killing a criminal goes on the run to escape his brother's vengeance.

I hope this helps

Good Luck