https://www.metv.com/stories/allan-kayser-used-mamas-family-as-a-learning-opportunity

The actor was a student of comedy with the best teacher: Vicki Lawrence.

The real reason why Carol Burnett began limiting her appearances as Eunice in Mama's Family (https://www.metv.com/stories/the-real-reason-why-carol-burnett-began-limiting-her-appearances-as-eunice-in-mamas-family)

Burnett was more than a friend to Lawrence; she was a teacher.