Three Brothers with Wives Photographed One Man in Uniform Circa 1900 Tintype Spanish American War

A family portrait of siblings and their wives(?). The three men are obviously related, similar facial features and all wearing glasses. The women behind the men appear to be their wives, all three women look different and not related. 
The man on the left is in uniform and is very close to the civil war style, making this around the Spanish American War era, circa 1900. I can not see his insignia on his jacket or his hat to make out the exact date and time. 
Most likely the three brothers and their wives got the photo done prior to the brother leaving for war or his time serving in the military. 

Year: Circa 1900
Medium: tintype 

Size: 3 1/2 x 5 Inches
Condition: fine, with scratches with viewed closely and lightly wrinkled tin. The image is mostly crips and details are prevalent. 

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