Oroku Saki and Hamato Yoshi are half brothers, they were good friends but Saki's mother hated Yoshi's mother and Yoshi by extension.
Saki and Yoshi have a Yakuza father, he wasn't doting but he also wasn't emotionally available. He actually loved Yoshi's mother but was in an arranged marriage to Saki's mother.
He treats the kids the same (he loves them but he's emotionally constipated), he's cold towards Saki's mother. (She's a bitch)
Yakupops gives the title of boss to Saki because he showed interest in it and Yoshi has taken up acting.
The two fall in love with two different women, Tang Shen for Saki and Gumo.
Saki's mother sold Yoshi to Gumo, who had been dating him and fell in love, but she has to go by the rules of summoning. She has to make him suffer.
You guessed it she's Big Mama!
She tearfully tells Yoshi what happened and reveals that she couldn't tell Saki.
Saki's mother had killed Yoshi's mother and their father, then she was caught and executed.
Years down the line Tang Shen died during child birth and Saki swore to find his brother at all costs.
He began to grow an empire.
Police, Politics, Schools, Gangs, you name it, he's delved in it. Soon mystics came up, and he met and recognized Gumo.
He did research on deals before hand, warned by many yokai, and didn't blame her for Yoshi.
During the time prior mentioned, Yoshi fought and honed his skills. Never hating his brother but missed his family. He didn't even hate Gumo.
Soon fighting became to much and he stopped, he was kidnapped by Baron Draxum.
You know, mutegan was made with his blood and experimented on turtles with a year or two of each other.
The first was a Florida Softshell Yoshi named Donatello, Second was a Pond Slider he named Leonardo, the two being months apart and already two years old by human standards. A year passes when they joined by a Spotted Box Turtle that was named Michaelangelo and another two years when surprisingly and egg showed up. It was apparently a map turtle.
Draxum decided to take the other three for training, already mutated the egg and going for the five and four year olds.
Soon Yoshi gained the will to fight then.
He escaped and for their protection locked the babies in a cage with the egg and told the oldest two to protect them.
He managed to defeat Draxum and destroy his work before taking the cage and running to topside.
He couldn't return home, because during the fight he touched the ooze and was scratched by an escaped rat. Thankfully since the oozed was made of his DNA, he was partially mutated.
Gumo had already been in contact with Saki and found out what happened to Yoshi and about Draxum.
Later the egg hatches and he names his new daughter Rachel, though his boys jokingly call her Raphael.
Though Leo decided her name should be Rose and Yoshi agreed.
The duo assumes he died.
At this, Saki began looking into dark means of getting his family back and his daughter was being co raised by Gumo.
Saki slowly became corrupted by dark mystics and trapped within his own mind. Years later he became Shredder.
He soon learned of a mystic armor that Yoshi's mother protected and decided this was a step to bring back his family.
Why do I have the sudden urge to write the youngest brother Raph AU? But only during a Turtleverse episode. (Not all the turtles at once, I'm thinking either all of one Turtle. Mainly 03, 12, 87, and/or Bay.)
If I do Leonardo, Bay Leo is going to be in for a rude awakening.
