The Living Tombstone – It's Been So Long lyrics

So, I haven't actually seen anyone say who the "mother's" son is. My theory is her child in the song is the not only one of the children that eventually gets killed by the purple man but is stuffed into a golden Freddy suit. Let me explain. (This meaning will make no sense if you haven't seen the video for this song.) So in the video we see at the very end a room with 4 kids in the main part of the room. Then the purple man walks in with a fifth kid following. Then as the beat of the song Progresses, the purple man kills the first four kids (not the one who walked in behind him, he is still in the hallway.) Then he starts slowly moving towards the final cold. The screen goes black and we sew the faint gray words 'it's me' those two words are what briefly appear on your screen when you find the golden Freddy easter egg in the first game. These to words are then followed by a jumpscare, and Mike's sad death. That's my theory so thanks for reading!

Here I'm going to explain the true tale of FNAF:
1951(Probably) Fredbears family diner, as explained in the mini-games Freddy is giving cake to the children while a single sad child is standing outside. A purple car stops next to him, a purple man exits the car, murders the child and drives away. The child, after he's dead has tear stains like the marionette(puppet), also after the mini-game the marionette jumps at you, so my believe is that the first child killed possessed the marionette. The murder forces to the original owner to sell of to a company called Fazbear Entertainment but that doesn't stop the purple man with his life sentence of murdering children at Freddy's. As we found out by the newspaper clippings, the same guy that killed the first child took golden Freddy's suit, threw his endoskeleton into the marionettes gift-box, dresses up as Freddy, lures 5 children in the back room and kills them! And the police says they caught the killer but the bodies are never found. And thanks to another of the mini-games we found out what happened. One of the mini-games has you playing as Foxy the pirate, you run twice from the pirate cove to meet the children but the 3th time you see the purple man smiling at you and after entering the room you see 5 dead children. The next one that helps us is 'Give gifts, give life' mini-game where you play as the puppet and approach 4 dead children and give them gifts, after that the scoreboard says Give Life, you approach the children and transfer their souls in the animatronics(as seen in the song). As I said the bodies are never found presumably because they were stuffed into the robotic suits. The new restaurant stays open a few months until dead body stings starts to waft off the robots, and then it's shut down for health reasons. What started as a haunted puppet ends up as an army of possessed robots. The restaurant is reopened again, the new animatronics are equipped with facial recognition system which is connected to a murderer/s** offender data base, because the last restaurant is closed for kids being killed in it. The last mini-game has you playing as Freddy, you chase the puppet through a replica of the new restaurant and on very rare occasion the same purple man starts chasing you and when he gets you your screen crashes. I believe that mini-game takes place before night 1 where Fritz Smith hacks the animatronics A. I system like in night 7. Well there's a popular theory that the purple man is the phone guy, but he got caught and fired, unless the purple guy/Fritz Smith is somebody working for the original killer/ phone guy and maybe phone guy has a howl gang of people like this. On night 5 it's mentioned that somebody used the golden Freddy suit once again, and the guilty party is the former night guard - fritz smith. Then the bite of 87' happened where an animatronic bit a person so hard that he cracked open his head. I can't connect it with my story but there's still fnaf 1. Actually I can, he hacked the animatronics they went wild and started biting around. But not important. Ok FNAF 1, we know the new robots got scraped but the ghostly guy puppet should still be around. And he is! There's 3 main pieces of evidence that support this: The drawing in your office has Bonnie coming out of a gift like marionettes one, 2nd sometimes you can see crying children posters in the east hall(i forgot to mention the restaurant was once again reopened in 1993), and the visions at the end of nights in FNAF 2 are from FNAF 1's establishment and on 5th night you can see the puppet staring you down! Thanks for reading.

Taking everybody's theories, may end up to the answer. I have been reading a lot of people's opinions, they seem alike, they may have other facts and lead to the answer. All of them may be your key. (Notice) I guess, maybe, I'm too lazy to write a theory, yeah, well, thanks for reading! Bye, have a nice day :)

Yes this song does have points and the video isn't to far off m what we know now, but the thing is the Mother couldn't have been the puppet we know in the mini games it was a child killed out side of Fred Bears Diner, and secondly the Marrinette was killed before everyone else. I Think the Marinette was left there by his Brother and or Sister after the bite in Fred - bears, them being bullies left him out side of the place like in the mini game, Him being Scared of the place balls his eyes out, and the Purple Man comes up, now in the new game you can see Purple Guy put an Employee into a Golden Freddy suit, Meaning Purple guy had some trust into the company, being the owner or boss of them. The Marionette remembering him, now this is after his bite the one at the Diner now he may look like his brother and his brother being one of the kids who threw him in the mouth. So it may have been Purple Guy's job to watch over the place making sure no one got too close to the Animontronics and beause of the chance the Marrinette might had died he got fired.
And thinking that the fixed Child years later was his Brother, killed him for make him out of the job.

There is a video of this song. In the video, it showed a mother and her son hugging each other in the start of the song. Then, when the mother was busy talking to someone on the phone, her son wandered off to Freddy Fazbear's Pizzeria. The son partied with the animatronics and met other kids too. Then, he followed Freddy to the back of the restaurant. There, he saw Golden Freddy and became friends with him. Then, he went to the other kids and together they went to see Golden Freddy, but when they got there, he was nowhere to be seen. It was the perfect opportunity for Golden Freddy to kill them surprisingly. Then, the mother notices her son was missing but when she got to Freddy Fazbear's Pizzeria, she was too late. So, she put them in the animatronics but it was missing one suit for her son so, with a heavy heart, she put him in Golden Freddy, the murderer himself. The mother gave the children life but, the children, including the son, don't have any memory of who they were in they're past life so, they ended up like the original animatronics, killing people. The mother was so ashamed of her mistake that she went crazy. She cried and cried and ended up as Marionette. The purple streaks on her mask were her tears forever falling on her face.