The one subject that used to make Martha Wainwright bristle was her family, an unavoidable topic for a new artist whose parents are left-of-center folk singers Loudon Wainwright III and Kate McGarrigle and whose aforementioned brother is Rufus Wainwright. Now, three albums in, she welcomes it. And not a moment too soon, as her family provided the two driving inspirations for the new “Come Home to Mama”: the birth of her son and her mother’s death from cancer, two months apart. Wainwright plays the Sinclair on Thursday.
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