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

She sometimes takes a little pack of mayonnaise and she'll squirt it in her mouth all over. And then she'll take an egg and kind of...mmmm! She calls it a 'mayon-egg.' Are you okay?

George Michael

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

Lucille: I'll be in the hospital bar.
Michael: Uh, you know there isn't a hospital bar, Mother.
Lucille: Well, this is why people hate hospitals.