The Rubens perform at the Independent in San Francisco on Sept. 14, 2013. Roman Gokhman/STAFF. Falling back on his family to make music may have been a last resort for Sam Margin of The Rubens, who played their first two shows in San Francisco this week. After moving back…

This debut album could be subtitled, “’70s rock-influenced sounds from Australia.” Many in the U.S. are about to find out about the Rubens, a band that includes three brothers, as they open for Grouplove across the country. The story goes like this: They completed a demo and gave it…