You're his long lost only grandchild, when you were born both of your parents died. You're dad is his son which makes you his grandchild.

You thought you were now an orphan but now that you're 12 your grandfather found you and adopted you finally have a family

He is a CEO which means you'll inherit everything he has one day. He prepares you for enherating his company. He gave you lessons, and the best education there is.

One day you came to the company