Damn you, damn you all for ignoring my post. Allow me to post it agian to debunk rumor girl.
Taken from the insomniac games section of wikipedia concernig other sony 1st party companies...to get the jist just read the red bolded.
Naughty Dog
Insomniac has had a close relationship with fellow developer Naughty Dog from when they worked together in the same building on a Universal Studios backlot. Insomniac borrowed an engine from Naughty Dog, which was used in the original Ratchet and Clank game, and was modified upon for the each later PS2 releases. They make games that are similar in style, which sometimes contain references to each other (as seen in secret Jak 3 gun courses and the start-up menu in Ratchet & Clank: Going Commando, as well as on posters in some levels.). Demos for one company's games often appear on the other's releases. Spyro 2: Ripto's Rage! contained a demo of Crash Team Racing, for example. Also, Insomniac's Ratchet & Clank series utilized some technology from Naughty Dog's Jak and Daxter games. Because of their friendship, many fans have wondered if the two companies would collaborate on a game. However, they have, in the past, publicly stated that they don't have plans for making a game together, although both Jak II and Ratchet & Clank: Going Commando featured billboard cameos of each others heroes (and a scene in Going Commando shows Ratchet playing both his games, both Jak games, and Sly Cooper and the Thievius Raccoonus). This is taken one step further in Jak X: Combat Racing and Ratchet: Deadlocked as both feature Ratchet and Jak respectively as unlockable skins/characters.
Sucker Punch
Insomniac also shares some sort of relationship with Sucker Punch Productions due to Sucker Punch being listed in the credits list of Going Commando, Up Your Arsenal, and Deadlocked. Sucker Punch is known for its Sly Cooper franchise. Given the three companies' close ties to Sony Computer Entertainment and the fact that all three created platform games for the PS2, they have always been associated together. Ratchet and Clank: Up Your Arsenal even has a Sly 2: Band of Thieves demo in it, if the player presses R1, R2, L1, and L2 at the same time at the "Load Game" screen.
High Impact Games
High Impact Games is a newer company formed by ex-Insomniac staff, so far they have released Ratchet & Clank: Size Matters and are currently developing Secret Agent Clank, a sequel and interquel, both on the PSP.
Other companies
Insomniac has stated that some of Sony's development teams are starting to develop closer relationships and are sharing technology and ideas. Naughty Dog also credits various first- and second-party developers of Sony in Uncharted: Drake's Fortune.
