Siblings to be sure, but I'm not quite sure where you're getting the speculation of them possibly being twins. Well, except "The average gestation period is around 110 days,[95] the female giving birth to a litter of one to four cubs in a secluded den (which may be a thicket, a reed-bed, a cave or some other sheltered area) usually away from the rest of the pride." Found in this link
http://en.wikipedia.org/wiki/LionAnd I understand Wiki is a pretty poor source, more often than not, but it's late here, and I'm too lazy to get anything sufficient. Well, too tired technically, but I think you know what I mean.
