Has anyone seen this joke in The Reader?

A lady asked her husband; "If I fell into the water with your mother, which would you save first?" The husband looks reluctant and says; I can't swim! The lady said, "suppose you are willing." Husband said; "You can't swim? Of course I saved my mother. " The lady said, "suppose I can't swim either." Husband said; "You can't swim. Why did you take an old lady to the water? " The lady said angrily; "You idiot, didn't I say hypothesis?" Husband said without weakness; "Your assumption is not good? Why do you think my mother fell into the water? Why not assume that your mother fell into the water? " The lady fought back her anger and said; "Then your mother and I fell into the water?" The husband said with a full face of pain; "Suppose two old ladies are in the water. What are you doing? It's just that you don't like my mother Did your mother bring you up easily? "

Hope to adopt