However, all of this is just a teaser for the grandest mystery in Arrested Development: that of "Nichael Bluth."
Who Is "Nichael Bluth?"
In the season three episode "Fakin' It," Michael finds a birth certificate for someone named "Nichael Bluth."
The pragmatic Michael sees "Nichael" and assumes that it's his, and that the name is just a spelling error. The problem is that he neglects to notice that the birth certificate also mentions that the child is female and that her birthday makes her 39 years old.
Three episodes later, in "Development Arrested", Lindsay, Michael's sister, discovers that she was adopted and that she is actually three years older than Michael, making her 39 years old. A regular show would've ended the connection there, but Arrested Development has enough weird lore to make J.R.R. Tolkien shake his fists at god. It is a bounty.