-_-
SM64DS is acutally a sequel?! Now I'll have to play it, since I thought it was just a port..
Back to the timeline: The older bros being what they are because they babysat themselves seems to make sense, but since I haven't played PiT, then I can't add anything else.
Here is what I think the timeline for the Marioverse is..
Yoshi's Island
Donkey Kong
Mario Bros
Super Mario Bros
SMB2
SMB3
SMW
Super Mario RPG
Super Mario 64
Paper Mario
Luigi's Mansion
Super Mario Sunshine
M&L: Superstar Saga
Paper Mario TTYD
Up until pretty recently, I only thought games that tried to continue the story of how they were trying to search for a way back to Brooklyn could even be considered for timeline purposes. That being said, I realised that Nintendo has long since abandoned the they're from Brooklyn storyline.
The games above are the only ones that I believe should be counted as true "story" games. Mario Party, Mario Kart, Mario Golf, Mario Tennis, and.. others are not story games.
If Ninty were sticking to the origianl story, then Mario, Luigi, and Peach wouldn't be appearing in games like NBA Street V3 and 1080 Avalanche (I think)