The others in the Sheng Family are beyond stupid- maybe not 3rd brother. The old man is going to do the exact same thing to them as Sheng Xiao, but they are too stupid to make their own money so they too can live their own lives.
I hate to think that there’s an old man like him in reality. Grandparents are usually loving and cariNg especially to their grandchildren. His behavior is too much.