Hi Virginia,
Thanks for the FDK.
RE: the kids falling asleep in Metropolis and waking up in Smallville - this is a routine occurance for them and as little kids they don't even question it. It isn't until their powers start to come on that they are brought in on the 'family secret'. Young kids are very accepting.
Green K and how does it affect Ultra Woman - I'm afraid I'll have to say - stick with the series. We will be returning to Clark and Lois and Clark and Lori in volume 6. There will be a complete discussion about the search for a green K antidote there.