Will Smith plays Howard, a man defeated by the death of his daughter to a brain tumor. He has no interest in life or work. He is partnered with three others in his work whose fate he directly affects, and all is not well in the world for their business. There is hope, but it hinges on Howard participating and he is not on board with that. At all.
So his friends/business partners go about fooling him. It is one part cruel, one part self interest on their part, and one part desperation to help unsettle their friend out of his crippling grief. I am not going to go into the wisdom of this approach, but rather to applaud the motivation of helping the grieving to re-engage with the living in a way that is meaningful for them. There is the potential for collateral beauty with grief, it can just be very hard to find some times.