The Bitter Couple marionette puppet show

Two cantankerous yet lovable marionette puppets, Maybis and Earl, enchant a town with their lively bickering. Their son David worries the arguing is unhealthy and arranges a therapy session; the sessions push the therapist to their limits. He tries to teach them lessons about listening, trust, and teamwork. Even when Maybis and Earl are apart, they have a heart for each other. So what is the bickering all about?