salt, pepper & nothing further's feed

I just wanna know how his relationship with his younger self would be like. Cuz since they're basically the same person wont his younger self get attached to him since they are so similar, does that mean he can become his own adopted dad? HAHAHA. Or maybe since they're so similar to each other they would just dislike each other lol. I just wanna see him and his past self interact fast. Usually in timetravel stuff two of the same thing cant exist at the same time so... is #12 a different kid then?