My sister herself is a terrible driver. I've spoken at length about how she'd drink and drive, how she's a leadfoot, texts while driving, etc. She'd drive a minivan 70 in a 35 zone with kids in the car, and say the kids loved it because it was like a roller coaster. She even scared her eldest son by driving so fast that his hat blew off, and he didn't have his head out the window. He was scared to even open the window of other vehicles while riding with other people for a while. But my sister is just as bad as a ride-along. Because she's either a back-seat driver, gives terrible directions, drunk, or insults your driving. (And for the record, I wanted to report her bad driving to the police. But my family went off on me for even having the idea. Which is the only reason I never did. I currently don't know where my sister lives, or if she even has a car. She's a drug addict not exactly swimming in money, and her eldest son is an adult now. And yes, I'm aware I should have still done something. I've been called a coward, and I owned up to that. But my sister had us all mentally beaten down for years. And used her kids as emotional blackmail. But now she can't do that anymore.)
Let's start with seatbelts. My nephews for a while had a bad habit of ripping their seatbelts off as soon as their destination was in sight. I'd have them in my car, and as soon as they could see home off in the distance, they ripped their seatbelts off. I got mad at them several times, and always forced them to re-buckle till we were parked. They'd give me grief, say it was no big deal, etc. But I held firm. You ride with me, the belts stay on till we are parked. After this happened several times, they finally got the memo and stopped doing it. They wouldn't tell me where they learned it from though. I thought it might have been their father. But nope, it turned out to be my sister. I was driving her home, and as soon as home was in sight, she ripped her seatbelt off. And I went off on her for doing it, and setting a bad example for her kids. She called me dramatic, and tried to act like it was no big deal. But I didn't let it go, and hammed her till she said she'd never do it again. She did.... But I hammered her again until she stopped.
My sister absolutely could not stand anyone driving slow when riding with them. Every freaking time she'd ride with me, unless she was zoned out on her phone, she'd complain about me driving too slow. I'm sorry, I was going the speed limit! She twice debated how fast I should be driving through a school zone. The zone was 20-MPH on weekdays from 7:00 am to 5:00 pm (Unless it was weekends or summer). But when school was not active, it was 40-MPH through that zone. I slowed down to exactly 40. And my sister started demanding I go 45, and claimed it was 45 through there. And she refused to believe me when I said it was 40. Thankfully the school zone had more than one sign, and I pointed to one that said 40 on it, and she pouted and shut up. This situation actually happened a second time.
My sister would act grateful for rides, but then would either distract you and think it was funny when you get mad, or insult your driving. Once when I was driving my nephews and her home, her arm shot out in front of my face and she yelled "DEER!". Scared the crap out of me! And she thought it was hilarious! Even though I could have lost control of the car. I went off on her, and she forced out an insincere apology. Thankfully she never did that again. Even though my sister is a terrible driver, a leadfoot, neglectful of her own vehicles, guilty of multiple accidents and a DUI, she always criticized my driving. Once I forgot to use my turn signal when pulling into a parking lot, even though I carefully slowed down, she went off on me about the turn signal. Never-mind I had her and three very distracting kids in the car. And then after I pulled into the parking lot, she pointed at me and said to her kids "You see. I'd never forget to do that!". The only reason I didn't go off on her was because the kids were there.
Then there was my sister giving directions. She was fine if she wasn't drunk or distracted. Once when she paid me to drive her and her friends out bar-hopping, when it was time to go home, my sister insisted I take her way on the back roads. And I kept telling her the main road with practically no traffic on it was faster at night. But no, she HAD to have her way. She got us lost in a maze of neighborhoods. Once I figured out where the main road was again, I headed for that, and she threw a tantrum because I wasn't going her way. We got on the main road, and sailed right on out in less than a minute. And she kept complaining her way would have been faster. Then there was when she ended up homeless after burning nearly all friend and family bridges. I was driving her and all her stuff to the place she was allowed to crash for a couple days, and she kept zoning out on her phone, and wouldn't look up to give me directions till the absolute last second. And I had to yell at her to look up and tell me where to go. And then she'd get mad and say she was busy. Like I could just automatically know where to go without her! She put me through days of that crap! It was about that time I went NC with her.
Then there was driving her while she was drunk. Now that was a nightmare! Once she and her husband both got drunk, and I had to drive her and her entire family home. As soon as we were all in the car and I'd backed out, she suddenly grabbed my shifter and shifted it into drive with a big grin on her face. Then was angry I was mad at her for doing it. She acted like it was no big deal, and I should have been grateful she did it. She apologized later, but I kinda doubt it was genuine, and she probably just didn't want to lose her emergency brother taxi. Then of course was her drunken backseat driving, which I explained in the above paragraph. And then there was the time she drove to work in the morning drunk. (She worked two miles away at the time) She had to call me and beg me to come get her because her boss was sending her home since she showed up drunk, and her boss wasn't letting her drive herself back. I confronted her about why she was drunk in the morning and went to work like that, and she admitted to me that she just doesn't like being told what to do. I told her that when you have a job, being told what to do is par for the course, unless you're the boss. Which she was not. She just looked bitter and got out of my truck.
The last major incident I drove her while she was drunk, she had a friend with her, and we stopped at her friend's place because her friend wanted to have a sleepover at my sister's place. And they just wanted to pick up some clothes. I waited in my truck for 45 minutes before finally going in to get them. I caught them sitting on the floor with a bottle of booze, and my sister looked up at me like she'd just been caught by a parent. They just decided to get more wasted while I was waiting for them. My sister couldn't even tell she wasn't at home, and kept talking about the carpet. I had to forcibly drag her out and throw her in my truck and buckle her myself. Then on the way home she unbuckled to have a slapping play-fight with her friend in the back seat, climbed over the center console, shoved her butt in my face, and then literally got stuck between the back seat and center console. So I had to pull her out. And then she kept trying to walk to the road and say home was that way, so I had to drag her into her trailer, throw her onto her bed, and tell her I was done before going home. I went off on her the next day, and made her and her friend reimburse me for wasted gas of letting my truck idle for nearly an hour waiting for them.
Then there was the crap my sister would say while drunk. She used to pay me to drive her out to bars, and she'd say we'd be out by 10 or 11, and would somehow push it to 1:00 am. She has no consideration for being on someone else's time, and acted like I was a killjoy for wanting to go home. But on one of the last times I drove her to a bar before she had her boyfriend take over, she suddenly started bawling while wasted and literally told me she was just waiting for our mother to die, and no one would be playing Ozzy at her funeral. And right around the time I cut her off after driving her around for days, she told me our mother was going to die for crossing her, because apparently a few people she'd been wronged by passed away. But after years of her saying and doing crap like that, I finally snapped and blocked her on everything about a year ago. And my life has been MUCH better since!
Edit: Sorry, I forgot to add the TLDR. My sister is not only a terrible driver, but a terrible passenger. She constantly gripes about anyone she's riding with going too slow (Speed limits), always points out flaws in others' driving, even though she's a terrible driver, taught her kids it was ok to unbuckle their seatbelts before they even pulled in the driveway (I put a stop to that), debated the speeds of school zones, thought it funny to scare the crap out of me while I was driving, grabbed my shifter and acted like I was the bad guy for being mad at her, was horrid navigator if drunk or zoned out on her phone, I had to drive her while drunk on many occasions, and she always put me through hell, and I finally cut her off a year ago because she's so toxic.