#core.logic

This is what I came up with (with help from the codehaus page on calling Clojure from Groovy)

As you can see, when the data goes in to the Clojure method, we need to call read-string on it to get it into a Clojure string, and when the List of Maps comes back out, the keys of each map are of type clojure.lang.Keyword, so we need to wrap our String keys with clojure.lang.Keyword.intern when querying.

Other than that, just a case of cut and paste.

When this script is run (not in the Groovy Console, as it struggles getting its classpath right), it prints the grandparent->parent->child family lines that have Michael (our parameter) as the parent.