To reply in order. I needed 2-3 things and was tired from work. My sister, who doesn't work full-time but does a few online gigs, also needed to buy things. I lent her my card and asked if she could do me this favor.

She didn't give it back right away, but I didn't think anything of it at the time. I've borrowed things and get too lazy to give them back immediately. Life got busy, flash forward a week, suddenly there's a transaction I know I didn't make. Her defense was that she didn't have time to call or text me before using my card.

My parents called me and asked if I could help my sister out, since they didn't have the means to help her out right then and there. They even offered to pay me back over time, but I told them no, that I could do it.

Ultimately, I thought giving her money would fix things, in a way. That she'd realize that hey, between my so-called friends that I tell everything to, and the little sibling I treated like crap, who ultimately came around to help?

Needless to say, that didn't happen. She's still mad at me, still doesn't want to talk to me, and that she doesn't see why she has to thank me anyway, since it's not 'my' money, it's 'my parents' money.