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Whenever Deanna Troi's freewheeling mother Lwaxana (Majel Barrett) pays a visit, she's always certain to leave a lot of emotional turmoil her wake. This instance is no exception, as Lwaxana takes Worf's contentious son Alexander (Brian Bonsall) under her wing. As both Worf and Deanna bristle at Lwaxana's well-meaning maternal advice, the rest of the crew must contend with a nasty species of parasites which has attached themselves to the Enterprise. Written by Peter Allan Fields, the Emmy-nominated "Cost of Living" originally aired April 25, 1992.