This is a nice story, but it fell into the same trap as damn near every other time travel story. They left the loop open. This story will repeat over and over ad finitum. Bob goes back, saves his mom & her relationship with him. Goes back to his present, presumably gets killed by a jealous Graham, which prevents him from going back to save his past self's relationship with his mother.
This, in turn, means he goes to Singapore, becomes the big physicist he was meant to be; he and Graham develop the wormhole time machine tech, and then Bob goes back yet again to save his mother.
On and on the carousel goes.
I'm just not sure what Graham did to Bob in the future; that part is very fuzzy.
I do love me a time travel story, but this one didn't really stick the landing, due to the paradox. Time does not like paradoxes.
This, in turn, means he goes to Singapore, becomes the big physicist he was meant to be; he and Graham develop the wormhole time machine tech, and then Bob goes back yet again to save his mother.
On and on the carousel goes.
I'm just not sure what Graham did to Bob in the future; that part is very fuzzy.
I do love me a time travel story, but this one didn't really stick the landing, due to the paradox. Time does not like paradoxes.