Wife is out of town for the week. I get a call from my sister (while I was at work) who is 8 months pregnant (and trying to save as much money as possible as they've had major house repairs recently and won't be working for a while). She is close by and as she dropped her car off for repairs. The repair centre normally gives out free rental cars but they noticed her licence has expired so they couldn't give her one. She called me and asked for a lift home. I said better yet, I'll come get you and you can borrow the car for the day as we have two (an old manual one I paid for prior to meeting my wife and a newer one we paid for out of our joint account). I offered the newer one as it has more safety features. 


My sister said suggested I check with my wife to make sure it's OK for her to borrow the car but assumed my wife would be ok with my sister taking the car to the licencing centre to renew her licence and do whatever else she needs since my wife is out of town anyway and we have an extra car.


Sister is not a good driver (about a major accident per year and a bump/scrape or two per year) but said she will cover any damages on the off chance she gets into an accident. I'm cool with that, plus I grew up in the type of family where you just help each other out. They ask for a hand and you give them an arm type deal. 


Wife later tells me I'm an asshole for offering the car. Am I though? Thought I was just a good brother and if anything goes wrong, my sister will take car of it. Plus our third car comes tomorrow so we will have three cars until I can sell my old one. I don't see how this affects us negatively. 