Nobody's brought this up yet.. but do you think your dad really has a "problem"?? cuz it sounds to me as if that may very well be the case. if your mom, sister and you can't stand him or his attitude...has anybody told him yet or clued him in that he might have a problem? some people don't understand that their behavior is over the line and physically NEED to be told.
this drive might be good for you to talk to him and see if there's any type of underlying issues and to see if he'll talk to you about them... if his behavior swings are over the edge..if he goes off in a tantrum, or throws things, why is that? cuz irrationalities like that could be a part of a bigger problem... people with bipolar disorder usually throw tantrums at a split second or tend to throw things or hurt people....bipolar is ALL about control....the "if you want me out of your life" issue IS a symptom of depression, no bones about it...the tantrums could be depression too or something else...has he ever made you feel like he's obsessive or compulsive? does he feel like all you kids are growing up too fast and he's losing it/you because of that? is he not ready to let you go yet?
also, if you want him to respect you, you're gonna have to stand up to him and up for yourself and tell him to knock it off and that his behavior isn't acceptable...see what kind of body langauge/behavior he does when you do that...that should clue you in really quickly!
it sounds to me like he has some inner issues to deal with... esp when you say
He has absolutely no control over his emotions.
and honestly, it's the family that needs to bring it out in the open and get him to see that maybe he does need some help.. maybe he needs to talk to someone or maybe he just needs something to help him face the day and be able to take charge without *it* taking charge of HIM...
but if it's a mentality problem, even minor depression, your gonna want to deal with it sooner than later because later can get him and your whole family into a whole 'nother bees nest!! been there, done that.
I'd suggest before you decide to let him ride with you, bring these issues to the forefront and talk about it BEFORE you even get into the car.. not only that but you could stipulate that if you don't talk, he doesn't ride and if he blows a gasket, help him get help for that because something's NOT right there. he should want to talk to you, your his son.
but sometimes, they have to hit bottom before they see the light and sometimes, if they don't see/want/need "your" help, then you have to help them hit bottom (nicely) so they can see the light and recover
my dad used to say things to me like "if you want me out of your life..." and that's when i figured out he was having a depression problem but i could never get him to go see a doc about it and before long, he hit bottom but it was too late to get him help cuz the serious damage was already done and he'll be finishing "his time" in March. if your dad has a problem, you and your family need to help him see that and help him get some help for it BEFORE it gets out of hand...head colds (as i call them) don't become embarassing or emotionally trying until someone gets hurt, goes to jail/prison or commits suicide from it.
sometimes i think if i would have just told my dad that i was afraid of him because of the way he was acting, he might have gone and gotten the help he needed and we wouldn't be where we are today. i think telling a parent information like that really gets them thinking
heck, i even have a cousin that works in the psychiatric ward of a hospital and she doesn't even know she's bipolar.. she just won't believe it and won't take the meds for it....she controls everything include one of my aunts (believe it or not).. it's her way or the highway...her dad is the same way and it got down to where he would hit her mom if she didn't "stay" in his "control"....so stuff like that can happen.
talk to him, get everything out in the open and see how it goes from there... don't even allow him to get into the car until that happens because a car can be used as a weapon and if your afraid your dad might hurt you during one of his episodes, then you don't want him in there and i would certainly tell him that.