You would be hard-pressed to find a family tighter than the Demés.When Chris Demé, 45, of Penn Valley, heard that his brother needed a kidney because of failure due to the rare Alport Syndrome, he didn't hesistate to offer. Brother Robert Demé wasn't shocked because of the family's penchant to hang together, but he was still mightily impressed."There's not enough world to show how much I love him and appreciate what he's doing," Robert, 46, of Grass Valley, said of his donor brother. "As soon as he found out, he jumped right on it."According to Robert, their older brother, Larry, …