Jonathan and Martha Kent:
Ive always liked the idea of his parents being a little bit younger when they found Clark. It gives more credibility to them actually being his parents rather than grandparents and it contrast with Peter Parker being raised by the older uncle ben and aunt may. The only issue that potentially arises is if Pa Kent dies while Clark is young (teenager) how do you justify it? He could potentially have a heart condition in his family that is alluded to in the beginning of the movie, so the audience can believe he has a heart attack. Another option is to imitate what the comic has done recently in having Jonathan die as a result of Brainiacs attack. Perhaps he lives through the first movie but dies in the secound or third. It would allow us to revisit Clarks youth again via flashbacks while not re-telling the origin story again. Also it would allow for some real character exploration with Clark/Superman, Martha, maybe lana, and pete ross.
Marthas portrayal would be a younger version of Kay Callahan (I think thats her name) the woman who played martha on Lois and Clark. She nailed the character and crafted a truly unique look at the woman who raised superman. I think a younger version of that character would add a lot of heart and humor to the movie without looking like a copy of aunt may.
As for Jonathan, I like the dad from Lois and Clark as well. The wise, but quiet/nurturing father. We have to keep in mind what makes Clark eventually choose to become superman, and that really is his upbringing. His father needs to evoke the kind of inner strength that superman will later embody. I dont think his dad in smallville ever reached that level or inner strength. It all depends on how long he sticks around in the movie but care should be taken so the portrayal is accurate
