Final answer:
The two blessings stressed while Joseph lived in the house of his master are the prosperity of the household and Joseph's righteousness and God's favor upon him.
Step-by-step explanation:
While Joseph lived in the house of his master, the blessings that are stressed are twofold. Firstly, his presence evidently brought prosperity to his master's household, as was common in the biblical narrative. Secondly, Joseph's righteousness and God's favor upon him are highlighted, showing that the blessings extended beyond material wealth to include moral and spiritual dimensions. This mirrors the experiences of slaves in historic times, such as those depicted during the Emancipation Proclamation, as slaves navigated the complex emotions of freedom and the separation from their former masters--attachments formed over generations.