Should I be upset with my sister-in-law who asked me to split her Costco card membership fee?

Anonymous
So costco Australia just recently made online shopping available
I usually go costco with friends since they have the membership cards

But I know my sister-in-law has one as well

So I asked her if I could use her card to buy stuff online:

Me - hey sis, do you have costco card?
Her - yeh i do but have to renew it in 3 months
Me - oh okay, costco has online shopping so was wondering if I can use your card
Her - yeah u can use it.. and when I renew it, we can split it.. its $60 membership fee so $30 each..

Like wth?
I thought we are family
I was thinking she pays the fee since its her membership
And whenever I buy stuff online, I pay her back
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GirlGuy
Updates:
8 mo
And the thing is.. I've bought her son (my nephew) so many things.. from gucci shoes, nike shoes/clothes... etc.
8 mo
For the idiots that keeps assuming I used her card multiple times... I HAVE NEVER USED HER CARD.
It was my 1st time asking to use it.
Read the description properly.
Should I be upset with my sister-in-law who asked me to split her Costco card membership fee?
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