I just discovered the latter, and i’m curious. They both have amazing voices!
Yep. Half-siblings. They are both children of Loudon Wainwright, another singer-songwriter.
Here’s the two of them, performing together in DC:
http://www.youtube.com/watch?v=l4NnEcf7J-s
August 26, 2008, 3:20 AM EDT
Daughter of Suzzy Roche and LW III.
I believe Rufus is from Loud’s marriage to Kate McGarrigle.