After the Eldest Brother of the Real and Fake Young Masters Left Home

A Beloved, Frail, Gentle Big Brother

Looking for books similar to *After Being Reborn, the Villainous Older Brother Was Doted On*. The kind where wealthy parents have a younger child and start neglecting their eldest, preferably the big brother, who’s busy working at the company and whose health deteriorates. I want the parents to feel guilty and dote on him afterward! No female lead! Focus on family affection.