Hands are tied, what do I do?

I am beyond frustrated right about now. I honestly just do not know what to do anymore. My dad spends so much in gas money that a week before his check comes he is out of money, and I end up giving him money to get by on. Hubby really thinks I should not give him any money. But he isn’t the one home all day and has to put up the bullshit, I am! Hubby and I left around 4:40 to grab a quick bite and to get groceries and put gas in our car. The trip down for his reunion finished off what was in there. I had fuel perks built up from Giant Eagle so we save $1.20 per gallon, so we only had to pay 1.49 per gallon and we filled up the five gallon can. Then we came home. While we were gone I guess dad came home and all my daughters butt about what was for dinner and seemed pissed off I was not home! There was things for him here that he could of eaten. There is always things here, and he only had three dollars and opted for a sandwich at Arbys after waiting around for me to come home. I guess I should of been here to prepare his meal for him? I think he is capable of putting in pizza rolls, or fixing a burger or heating up his butter beans he likes for his dinner. So I was upset and when he got home I sat down and talked to him but he just lies to me about his gas so I got the calculator out. He gets 965 a month, with his bills, insurance and car payment that’s 525 a month shot. So that leaves me 440 a month left. That gives him $110.00 a week for gas and what ever he does. Truck pulls, tractor pulls, fairs, if he decides to eat out. And somehow the week before his check comes he is broke. Where is it going? I already can tell you that, GAS!! He has put over 15,000 miles on the meter for the car and has only made THREE car payments, so in four months. That’s 3,750 miles monthly! That’s a lot of miles and there is why he has no money left. So I tried to point that out to him so I said now you check doesn’t come till Friday what are you going to do? I gave him twenty dollars Friday night so he could grab a meal out yesterday since we had the reunion and I was not going to be home to prepare a meal for him. He put 10 of that in his tank, and I don’t mean his stomach! So his answer to me when I asked what he was gonna do? He said and I quote: “Well I guess I won’t move all week and just sit!” with a nasty tone, WTF??? What the hell am I suppose to do? Its not my fault. I even give him money 5.00 to wash the car or if he runs me to the store during the day I give him 10 for food. Or if he runs an errand I give him money. So what else am I suppose to do? We are already paying his portion due each month for the hospital bed. If he just sits in this house all day, do you have any idea the hell I go through doing that? How mean and rude he is to me??? It’s unbearable anymore. With the kids here that I watch? Its just too hard to deal with him and them at the same time cause then he is really cranky. He swears around them all the time as it is, if he was here all day, I don’t think I have a job very long. So I dunno what else to do. I suggested he join the senior center and baaaahhh, or just paying for a bus pass and just go for rides to get out and about just he won’t be driving is the only difference and was baaaahhhh. Then precedes to tell me it will be tight again next month for him cause of the Lake and Portage County Fairs. He feels he needs to go every night its open. So is that a hint??? Hubby frustrated at me. Well what do I do? He is my father? He’s my responsibility, and I deal the best way I know how. What else do I do? Get a night time job???  I don’t have it in me to sit all week and listen to him moan, bitch and complain cause he can’t drive his flipping car.