yes, jimmy (aka "mr oleson") was the owner of the DP, and perry was still the EIC of the planet until he was elected mayor at the end of the ep. i think he delegated a lot, tho, since he was focusing more on the campaign.
for the record, the ep was "tempus, anyone?"
as for the kent/clark family tree, i have little or no first-hand knowledge, but a websearch turned up
this page, which seems to have a thorough explanation. remember, tho, that most folcs don't read the comics and that they're not considered part of l&c canon. so, if you want to just make people up, that'd work just as well. of course, having this listing could save you the trouble of making people up. <shrug>
oh, one more thing... the page seems to refer to clark's
pre-crisis family tree, so, actually, none of it is in official continuity anymore. not sure if there is much of a post-crisis family history yet, tho.
Paul