Michael Bluth is the second oldest Bluth son, but the most competent one.  When George Sr. went to jail, it was Michael who was stuck running Bluth Company and keeping the family together.  Michael's wife, Tracey, died of ovarian cancer two years prior to the first episode and left him to raise George Michael on his own.

Michael Bluth Quotes

Maeby: Do you guys know where I can get one of those gold necklaces with a "T" on it?
Michael: That's a cross.
Maeby: Across from where?

George Michael: I have Pop-Pop in the attic.
Michael: What? The mere fact that you call making love "pop pop" tells me you're not ready.

Arrested Development Quotes

(holding stuffed animals) These are my awards, Mother. From Army. The seal is for marksmanship, and the gorilla is for sand racing. Now if you'll excuse me, they're putting me in something called Hero Squad.

Buster

Michael: (to George Michael) I'm gonna give you a promotion. Welcome aboard, Mr. Manager.
George Michael: Wow! I'm Mr. Manager!
Michael: Well, manager. We just say manager. And you can hire an employee if you need one.
George Michael: Do you think I need one?
Michael: Don't look at me, Mr. Manager.
George Michael: Right. It's up to me now. I'm Mr. Manager.
Michael: Manager. We just say, uh --
George Michael: I know, but you just said --
Michael: Doesn't matter who.