I think it's a mistake to refer to that recording as a "cover," it's really a *collaboration* between Loudon and Kate & Anna McGarrigle, Chaim Tannenbaum and Rufus & Martha Wainwright (the children of Loudon and Kate).
On the other hand, Kate & Anna McGarrigle did record Loudon's "Swimming Song" on their first album, recorded while Kate was still married to Loudon.
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sj