Hmmm, so in a roundabout way, it IS possible that Lex killed Clark's mother!
If either Jonathan or Martha has died, it would indeed be Lex Luthor's responsibility, and when Clark gets his memory back he'll have an even harder time holding back from attacking the man. Old Lex will have a lot to answer for, assuming that his long-term plan is thwarted.
Of course, it's also possible that Jonathan and Martha left the farm for Metropolis when they heard that Superman's mission failed. I don't believe that either Clark of Lois has spoken to them since the failed attempt to break up Nightfall. And if that's true, they may have escaped the worst of the devastation from the fragments in the Midwest. They might be in a shelter in Pennsylvania right now, waiting for the roads to clear so they can keep moving east.
I hope so, anyway.
When will Lois put some of the pieces together (the underground shelter, her apartment, Lex's attitude when she finally said 'no,' Clark's hatred of him) and begin to suspect that Lex, a man who seeks power, may be connected to 'The Boss?' Maybe they'll find out just what Nigel was doing when he got clobbered and realize that an honest man wouldn't have been on that errand at that time. Just a thought.
I wonder whether Clark's memory will begin to return while Lois is staying over? If so, he'll need her emotional support while he deals with the pain of returning memories and possible loss. It will be another chance for them to grow closer together, and without realizing it Lois will begin to depend more on Clark while she thinks she's taking care of him.
This really does keep getting better in each chapter. Keep them coming!