TMNT2012: Only in New York

My adoptive sister is an alien psychic being hunted by other aliens from another dimension, my biological brothers and father are mutant ninjas being hunted by an evil ninja clan, and I'm a mutant turtle being trained in ninjitsu and also being hunted by the evil ninja clan and the aliens from another dimension, along with mutants that are completely out of their minds. Only in New York.
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In this AU, when the turtles were five, Raphael got lost when trying to help Splinter on the surface. After a while of not being able to find Splinter, Kirby O'Neal ends up finding Raphael in an alley. When the two are still unsuccessful in finding Splinter, Kirby decides to let Raphael stay with him, his six year old daughter April, and his nine year old daughter Robin. Ten years later, April and Kirby don't come home from the store. Raphael gets to be a combination of annoyed and worried and goes to look for them. When he does, he runs into three mutant turtles just like him. Will Leonardo, Donatello and Michelangelo make the connection between this new turtle and their lost brother? Will Raphael know how to balance both of his families? Will he want to? Will Splinter even tell Raphael what happened? Read to find out. Part of my TMNT AU series. Disclaimer: I don't own any form of TMNT or it's characters. I will also be doing alternate versions of existing episodes of the series, which belong to Nickelodeon.