In each faction he placed a synth so that he had an oportunity to present you with situations and evaluate the results. I think he had set a path that would lead you to him if you passed certain test that would finally lead you to the Institute an prove you had what it takes to replace him and have a DNA link to the Institute. He then invites you to a meeting where he informs everyone that he is dying and appoints you as his sucessor. Shaun explaines that he relesed you as the backup DNA in an experiment and that you had now passed the test. Think back to the conversation with Shaun on the rooftop of the CIT building. and if you destroy the institute you get that synth shaun as some sort of companion. the 10 year old shaun that you get to see in the institute IS a synth. and i cant tell where the real shaun now is. IT COULD BE, that the radio DJ talking about piper is a bug. and yes you get a ton of info about kellogg in the institute, that kellogg was preserved to become older than normal.

that 10 year old shaun must be the real one. why would kellogg babysit the 10 year old synth shaun? no this scene must have been the real one. and the mayor told you kellogg lived with a little boy in the city not long ago wich in combination means that this scene with the 10 year old shaun cant be happened 60 years ago. you can hear the normal diamond city DJ talking about piper. then the DJ spoke of the new californian republic.but now as kellog sits there with shaun. it was playing too in one of the other scenes when you saw kellogg and his mom. when youre in kelloggs memories, in the last scene where he and shaun are sitting in his shack, waiting for the instituteagent to pick him up and bring him into the institute, there is the radio playing in the background. Hey guys, i came across something more mindblowing then the initial 'my son is 70 years old now' thing.

Talk to father fallout 4