It won’t buy happiness, but it could buy some very important things for your family: It could buy them a place to live in a good neighborhood, where they are surrounded by people who are not criminals/dangerous. It could buy them top quality food for their health. It could buy them higher education. as in a tuition at a good college one day.
It could buy them tutors if they struggle in school. It could buy them the ability to travel to different places and see how the rest of the world lives, see other cultures. It could buy a very safe vehicle for your family, so you will be a little more safe if there was an accident.
It could buy you life insurance, so you can make sure your family is taken care of if something happens to you. It could buy your family really good health insurance, in case one of them gets cancer or a disease that requires specialty treatment. It could buy you a good retirement, so you don’t leave a burden on your children to have to take care of you one day.
So no, not happiness exactly. But some things that might come in handy.