i know that only one member of the household needs to be a DC member to get discounts. does this also apply if my bf and i live together? if i join DC in my name, can i get discounts for both of us? or does this only work if you're a married couple? a related question: usually my bf drives, so we rent cars in his name. if the DC membership is in my name, can we get a DC discount on a National rental in his name?