Lindsay Bluth Fünke is the daughter of the Bluth family and Michael's twin sister.  Lindsay, in an act of rebelling, married Tobias Fünke, a perpetually unemployed psychologist.  Lindsay always believes herself to be the dedicated activist... only she seems to lack the dedication.  By the end of season three it was revealed that Lindsay was actually adopted.

Lindsay Bluth Fünke Quotes

Lindsay: You've had $80,000 worth of cartography lessons. Get us a channel to the ocean.
Buster: Okay, okay, okay.
(Pauses)
Buster: Obviously this blue part here is the land.

Um, I forget their name, but I know they're hungry. I think some are thirsty.

Lindsay
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Arrested Development Quotes

Lucille: Buster, nice of you to take a break from that common whore you've been dating.
Buster: She is not a whore, mother, she happens to be the new secretary of the Bluth company. And yes, she may be more experienced than a normal girl, but sometimes love should be terrifying.

Um, I forget their name, but I know they're hungry. I think some are thirsty.

Lindsay