Hello my friend, @yourloveguru
From your story it appears that despite being upset with your brother's carelessness and his reckless spending, you are supporting him in running the shop to help his family. Although this is a noble deed, there is still a little time left for his son to grow up. You can also help them by starting some other work that you have done. Nowadays people do not remember the sacrifices of their uncle.
And you are a very good person who helps your uncle. But do all this in a practical manner. You might have to repent later.
And yes, I have seen a lot of the world and I must be twice your age.
Greetings with love.