You are making a subtle mistake here. Tyler's legal defence came from his parents' finances, not his grandparents. Also, Tyler opting to become a whistleblower

You are making a subtle mistake here. Tyler's legal defence came from his parents' finances, not his grandparents. Also, Tyler opting to become a whistleblower on Theranos caused a strain between his grandfather, who is a Theranos board member, and his own family. So unless they resolve the impasse, it is unlikely that the grandfather will offer a helping hand (financially) to his son and grandson after outing the fraud in a company associated with him.