Being completely new to the game, I randomly decided to help take over Whiterun for the Stormcloaks before I got a chance to finish the Companion quests. Does that mean that the Companion quests are no longer available? Are the options to marry the various Companion members still a possibility after taking over Whiterun?
(P.S. I am also wondering if it is possible to cure lycanthropy, aka being a Werewolf, after having taken over Whiterun. I know there is a way that involves one of the last Companions quests, hence why I asked if I could still finish that quest line after taking over Whiterun.)