beta
MC should just make new companies that benefit both the grandpa's company and him. Then, slowly take the shares of his grandpa's company and shove the chairman position to his big bro by threatening that the new companies will pull out if they didn't give the title to big bro.
But since it's too late, just make ML's grandpa threaten MC's grandpa that MC shouldn't get chairman position if he truly love ML.
If MC's grandpa disagree, ML's grandpa can say "ML is my only grandson. You have 2 grandsons. "
_(:3」∠)_
That's all of my 1 smol braincell can think of to help this pitiful MC.