This question contains spoilers about the end of the movie Stargate Continuum. I'm not putting this in spoiler code because this movie is over three years old.
At the end of Stargate Continum Cameron Mitchell travels back in time to the year 1929
and lives in that time period for ten years until 1939 when he stops Ba'al as he's exiting the Stargate by shooting him in the head.
There, he meets his grandfather and the two become friends. According to Stargate Wiki, Cameron was born in 1970, if we assume Stargate takes place in the present, and because we know that Stargate Continuum was released in 2008, we can assume that the movie takes place in 2008 as well.
In 2008, Cameron Mitchell would be 38 years old.
When he goes back in time to 1929, he's still 38 years old.
In 1939, when he shot Ba'al, he would be 48 years old.
31 years later, in 1970, he is born.
In 1970, the Cameron Mitchell that went back in time would be 79 years old.
The movie shows that he did continue to exist in the primary timeline by showing a picture of Cameron's grandfather with his 'best friend' (time traveller Cameron) on the inside of younger Cameron's locker.
I haven't seen many episodes of Stargate SG-1 beyond season three so I don't know much about Cameron Mitchell's backstory.
My question is this:
Does the show suggest any evidence that young Cameron's upbringing was affected by an alternate version of himself living during the time of his grandfather? (Were his parents rich? Perhaps granted money from a friend of the family that was close to his grandpa? Was his education paid for by a mysterious benefactor?)
Does it show any evidence of his being alive in the past having any effect on the continuum at all? It seems to me that he could have used his being alive in the past to warn himself of potential dangers in letters or to place convenient items that would help in critical situations his younger self or team would find themselves in as the years wore on.