Final answer:
Mr. Henry Dashwood is upset because his uncle's inheritance was left to his son and grandson, which is indicative of the complexities of wealth distribution and inheritance matters.
Step-by-step explanation:
Mr. Henry Dashwood is upset about the will because his uncle's inheritance was left to Henry's son and grandson. This situation reflects a common issue within literature and society regarding inheritance and the distribution of wealth after death. It also speaks to the societal dependencies and expectations of the time, especially in familial contexts where inheritance taxes and property rights significantly affect relationships and individual fortunes.