Hi there! First off- Do you happen to have a date for this photograph?

Hmm- Those definitely don't look American to me. Judging from the caps, these men are in Austro-Hungarian uniforms, which would make sense for Czech relatives. Though obscure, I believe you can almost make out the Hapsburg eagle on their belt buckles.

The shoulder wings on the epaulettes indicate that both gentlemen are members of a Jäger, or rifle regiment. The plates on the caps, though obscure, would display a national cockade. The star collar badge on the gentleman on the left is a rank insignia- This badge signifying he is a 'Patrouilleführer', or lance-corporal. As for the shoulder cords- I'm unsure. However, I believe they indicate the arm of service.

All this seems to indicate these gentlemen are members of one of the Bohemian Feldjäger battalions.

I hope this was helpful- If you want, I'll get back to you when I have more information. If you're interested in learning more about Austrian uniforms, the most comprehensive English-language source I'm familiar with is Richard Knotel's Uniforms of the World translated by Roland G. Ball.