Amy is the daughter of Bob and Carol. Bob and Carol, at some point in their lives, married Chelsey and Dan, respectively. Egbert is the son of Chelsey and Bob, while Fabio is the son of Carol and Dan.
Egbert is Fabio's _____.
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"Stepsiblings" (stepbrothers or stepsisters) are the children of one's stepparent from a previous relationship. They are unrelated by blood.