Time that passed

This story was suggested by @KAIRAYSMITH All the ideas and credit go to her :)

Going back several years ago, Kai and Nya were 'adopted' by their aunt and uncle, Bob and Abigail Smith. Although Abigail was entirely nice to Kai and Nya, Bob had other intentions. Years later Bob is in prison and the two Smith siblings along with their cousins are Ninja. It was essential for Kai to get a surgery due to the wounds and damage that his uncle left on him. Kai survived the surgery but has been showing symptoms of sever sickness.

Will Bob reach his goal and kill his nephew?
Will Ray find his revenge on his brother for torturing his son when her was little?
And will Kai be cured?

Remember, all the credit goes to @KAIRAYSMITH