Final answer:
Abby and Martha do not recognize Jonathon in 'Arsenic and Old Lace' because he had plastic surgery, changing his appearance and leading to comedic confusion in the play.
Step-by-step explanation:
The question appears to be in reference to the characters Abby and Martha from the play Arsenic and Old Lace by Joseph Kesselring. Given the context, Abby and Martha do not recognize Jonathon because he has been away for a long time and returns after undergoing plastic surgery that dramatically alters his appearance. This lack of recognition adds to the comedic elements of the play as well as the development of the plot, where family ties and appearances are central themes.