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Daniel Shanks died on 1996-09-06.
Daniel Shanks was born on 1917-01-17.
Bob Shanks's birth name is Robert Horton Shanks.
Wes Shanks's birth name is Wesley J. Shanks.
Daniel Jackson was explained as being away with SG-11 on another mission. I don't know when the episode was filmed, but it is possible Michael Shanks was working on another project and wasn't available.