For me, I simply do all the necessary spending for other 3 members of family. I only give them one card unless that card gets canceled. It was the SPG in the past year, now it is all AA as I tried to get as much of that 50k action as possible. It doesn't make that big of a difference what they use as I do 90% of the spending on credit cards anyway.

It also helps that the phone reps can't differentiate male asian names from females so I do all the recon too. =)