Conversation so far:
What does the show tell us about Kramer's family?
Kramer was estranged for a long period from his mom, Babs Kramer, who works as a restroom matron at an upscale restaurant.
Is his father shown or mentioned?
Kramer mentions that he is the last male member of his family, implying that his father had died.
Does he have any siblings?
CANNOTANSWER.
Where is he from originally?
Kramer tells two art patrons that he ran away from home at age seventeen and stowed away aboard a steamer bound for Sweden.

Question: What is his education?
Self-contained rewrite: What is Cosmo Kramer's education?