Frank Reynolds show up during the second season as Dennis and Sweet Dee's father.  Frank was once a rich, successful business man, but after his divorce, wanted to come live like a slob with Charlie to experience life again.  He forced his way into the gang by buying up the building.  It was revealed that Frank is not the actualy biological father of Dennis and Sweet Dee, but might actually be Charlie's father.

Frank Reynolds Quotes

Dennis: All of us have gotten god damn weird.
Frank: I think we're just hitting our stride!

Dee: Who slams a door?
Frank: Babies.
Dennis: That guy has some real growing up to do. Have some repect for Christ's sake... I am legend.

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It's Always Sunny Quotes

Charlie: what is your spaghetti policy?
Dee: Are you hearing this? He doesn't belong in a place like this.

Mac: This brings me no joy at all. I feel nothing. I feel like you stole money from me and bought a shirt.
Dennis: With your money. That is what happened.