OK: 3 problems of logic here, that I can think of:
1 ) the classic paradox of a timetraveller killing his own grandfather
so that he will never have been born to kill his grandfather
That is inherent in this
plan insofar as it is his intention to prevent
his fathers 's death, which was his motive for building the time travel
machine in the first place, so if his father does not perish,
then: no motive to build a machine, but if it is not built, then he will die, as he did.
2) He has the rong target date: 1955 is too late.
Arriving in 1955, he can meet his father in time to say: "good bye" n attend the funeral.
In order to save him, he needs to arrive before
his dad began to smoke,
to warn him to avoid that addiction.
1955 is when his dad STOPPED
Death can be Nature 's way of telling u to stop smoking.
3 ) Space travel
: neither the solar system, nor its Earth
is in the same place that is was in 1955. Our solar system is in orbit
around the center of the galaxy; it has moven since 1955.
The time traveller needs to get back to the place
where his dad was before
he became addicted to smoking.
If he went back to 1955 (to be in time for the funeral),
and remained HERE
, in this place, he d arrive in empty space,
with Earth nowhere around and the father 's funeral happening
many 1000s of miles away.
He needs to intercept his dad at the intersection
of the correct co-ordinates of both time and space to prevent the fatefull addiction.