Considering this Clark is actually at least 20 years older that 'our' Clark - although his ID will have him born in 1966 - it's unlikely he was raised by Martha and Jonathon at all. The 'real' Clark will never be found.
And I'm sure that this Clark's ID will stand up to scrutiny. That means that Martha and Jonathan must be dead, right? He wouldn't take any chances that his "parents" could say, "Hey, that's not our son!"
I'm hoping that they were dead before this Clark took over the "Clark Kent" identity. I'm really hoping that this Clark didn't take over the identity and
then decide that the real Clark, Martha, and Jonathan had to be eliminated.
See what a good fic this is? It gives me unanswered questions to obsess about when I'm trying to sleep!