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.
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?
Michael: Keep in mind, we are building something that is not only for our kids, it's also for George Michael and Maeby's kids too.
George Michael: We can't have kids. What's the matter? What are you saying? It's not even an option really.
Michael: Eventually, you'll want to.
George Michael: Sure, I may want to, you know, now. It doesn't matter. Either way, I won't do anything about it. Come on!