"The Hren Family of Pueblo, CO"

I have recently started doing research on my parents and would appreciate any assistance offered. My fathers name was John George Hren (born simply John Hren) and was born in Leadville, CO on February 10, 1914. His parents were Johan (John) Hren and Franciska Mustar. They both emigrated from what is now called Slovenia (Austria back then). I have little information about either of them.

My mothers name is Irene Elizabeth Sickinger and she was born in Pueblo, CO on August 14, 1911. Her parents were Hubert Sickinger and Matilda Schmidt. They emigrated from somewhere in southern Germany and settled in the Galesburg, IL area. I have little information on any of my grandparents. I would be happy to share what little information I do have.