Madara had adopted an Uchiha, it was a baby boy.
Madara taught him everything, from fire jutsu's to lighting jutsu.
His name was Kimido Uchiha.
Edit: Check out the Prequel to this Book called 'Missing You!'
Sounds like a Gary Stu, so this better be justified or he's a bit too op.
Gonna refrain myself.... keep my chill but Gary you better have a good explanation
Jashin: DONT INSULT THE FOLLOWERS OF THE GREAT MIGHTY JASHIN
Beevous (Not Sure If I Spelled It Right...): "T.P for my pee pee"
Butthead: "T.P for my bunghole"
(From: Beevous & Butthead)