Would you be upset?

So let me start by saying I definitely have no problem helping others out. My husband and I have ALWAYS helped others out, even whenever we didn’t really have the means to help someone out we would. With that being said, when is enough enough? My husband and I own our own business, so we are well off financially. My brother in law works for us, he’s 22 years old. Because he is around often, my husband is always offering to buy his meals, usually breakfast or lunch. Then he will offer for him to eat dinner at our house. My brother in law will ask to use our washer and dryer and we let him do that as well. My brother in law is unable to get a vehicle loan because of his credit so we let him use our vehicle. We pay half the monthly payment, and he pays the other half. My husband and I just bought a brand new truck. I scheduled an appointment for our two dogs to go to the groomer. Because we didn’t want to put the dogs in our brand new truck we asked if we could use his car. He said he would use his car if we FILLED up his gas tank.... this annoyed me more than anything. Mind you, the groomer is only 10 minutes away. My husband got upset with me whenever I told him no we weren’t doing that and we were still going to use his car that we pay half for every month. My husband is a push-over whenever it comes to his brother, and I don’t know what to do about it. I think we help him out enough, and probably even a little too much. His brother has become dependent on us, in all aspects of life because of him working for us let alone everything else we do for him.