Happiness is a state of mind. If we talk about money , money too bring happiness for some instant. If you have money you can buy everything, but we couldn't say those thing as buy will bring happiness to our life. As I said earlier it's a state of mind . Money and happiness are complex things to relate with each other.
Money bring happiness when we get our basic needs like medicine,food, clothes and shelter.
Same like we pay fees of school our children on time . It also relief ourselves from stress. If we have money we can travels around the world and enjoyed that moment. But after that time , we could be happy or sad. It will be depends on the state of mind.
At last I will say . If we want to become happy we have to train ourselves on any situation whether we have money in our pocket or not!

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I want to invite @muhammad-ahamad @darwesh-khan @ulfatulrahmah