I've yet to visit a casino that didn't have some version of a leash that you could get for their player's club. I actually ended up with 10 cards on one leash when I did a run on the strip at Vegas one year. 
I'd suggest that sis get her own card. That way, if they both want to play different things at the same time, there's no trouble. Also, when they send out the low-value players perks, they'll both get something, too. That's the way I'd do it.
^-.-^

I'd suggest that sis get her own card. That way, if they both want to play different things at the same time, there's no trouble. Also, when they send out the low-value players perks, they'll both get something, too. That's the way I'd do it.
^-.-^
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