30th Anniversary is coming up..
“Metal Gear Solid 4 wrapped up in 2008, and the dev team took post-project time off right after that. But, of course, we were in a situation where we had to start planning for MGS5. So I started coming up with several ideas,” he said.
“I had several ideas for a game featuring The Boss and the Cobra Unit during the invasion of Normandy. I then handed these plans over to the team so they could take over and make the game. I presented my ideas to the team during the summer of 2008. However, simply dropping MGS5 on the younger staff members was a bit heavy and there was resistance to doing it without my involvement.”
https://www.vg247.com/2011/12/14/mgs5-the-boss-cobras-one-of-several-ideas-says-kojima/
During the March 29, 2007 edition of the Metal Gear Solid Podcast, David Hayter, when explaining Big Boss's characterization and why he went down the path he did, erroneously implied that The Boss was Big Boss's biological mother.
ignore the fact I can't draw straight, you should still get the point.