@Radagast
I suspect you have a different story in mind. A Fresh Start's MC's brother is a psychopath fixated on the MC. Its more Cain & Able, less The Waltons.
Radagast, you are correct.
I think I may have conflated the Brother-In-Law, or some other character with the Brother.
I recalled that the MC would often work with loved ones to encourage them to better themselves (and avoid tragic situations that occurred in his previous life), in particular improve their basic health. The MC would often consult with family and friends.
I recalled some aspects of the story, then went to My Library, opened chapter 1 and "confirmed" the MC had a Brother, then posted the link and my opinion.
There is at least one other story on SOL where a Brother improves his relationship with his brother; but it is NOT "A Fresh Star" still, it is a very good story but does not meet the parameters of the OP.