How Do I Correct My Dad?

really don't know how to start this but am so unhappy right now.

My Dad retired two years ago.
Before he retired, he never set up a business to fund his expensive life style when he retires.

We are all graduates and only the last born is yet to start work, so I expect him to be able to manage life from the little contracts he is getting, coupled with the fact that mum is still working (though she doesn't drop a naira from her income).

Late 2012, he became bankrupt and I had to send some money. Early this year, he called to request for more money to finance a project he was awarded by a State government.

I was like for such kind of project, he should get some funds from them for start up, but he said they wanted him to start then later they will pay up. I told my hubby and we gave him a good amount by God's grace, (he promise to return it but I know the money don enter voice mail).

A month later, he said he was not feeling too fine. I had to send him cash again for treatment.

To cut the long story short, he bought over 3 million naira car last month (he didn't tell me how he got the money cos he said the other project was a loss but I suspect he got his gratuity).

I wasn't happy when he told me he bought an over 3 million naira car because initially he told me he needed a small car that will not cost him more than 1million.

My problem now is, how can my Dad who bought over 3 million naira car last month coupled with his luxury in a 5 star hotel when he came visiting, call me today to request for money AGAIN that he is broke to the point he doesn't have money to fuel his car?
The new car he bought is packed in the garage because according to him, he has no money yet to pay for custom papers and plate number!!!!!!!

My pain is I don't know how to talk to him. My siblings are not too buoyant as I am so he doesn't disturb them for money.

I can't say no to him as well, he never said no to me when I was in school but I don't want him to just lavish his earnings on luxury and then call me to leverage it for him.
I account for every naira spent to my hubby, we don't live high and we have projects on going. I can't disturb my husband with my Dad's untamed taste and I must be able to support my hubby.

Have you ever been faced with this kind of challenge? How were you able to speak to your father/parent without being rude?