Well I will tell you what I Know:
Question 1: No the first Mutan in the Marvel Universe in Subnamor (called the first mutan by marvel)But is should be Apocalypse.
Question 2: No they are not brothers in the comic
Question 3: I have no idea
Question 4: They age very slowly (eventally he dies in the comics)
Question 5:Stryker did not know. In the books the Adimantium process was the one that made him forget who he was
Question 6:Victor has nothing to do with Logan's childhood.
The Truth is out There
I AM ANOTHER FRIEND OF ZARDOZ: