After their father dies poor, two disparate brothers move to Colorado to seek their fortunes during the Silver Mine boom in the 1800’s and struggle to stay one step ahead of an opportunistic politician.

Good to consider the need for a dual protagonist plot in your story when structuring it, if anything, for the perils that a dual protagonist structure presents.

One internal journey combined with one external goal is complicated and difficult enough as it is. So 2 separate yet similar internal journeys that work together towards achieving the same external goal is even more difficult to do.

I solute you Tara for your bravery in tackling such a plot and look forward to your next draft of this logline as it sounds like a very interesting idea.

Rules have exceptions, and I think dual protagonists can work, particularly when they are 'disparate' which suggests there is going to be a lot of conflict between them. So:

After their father is gunned down in a Colorado boom town in the 1880's, two feuding brothers must unite to outwit the unscrupulous mayor and hold onto his valuable mining claim.

Rules have exceptions, and I think dual protagonists can work, particularly when they are 'disparate' which suggests there is going to be a lot of conflict between them. So:

After their father is gunned down in a Colorado boom town in the 1880's, two feuding brothers must unite to outwit the unscrupulous mayor and hold onto his valuable mining claim.