As the novel progresses, Uncle Robin is shown to have become a well-fed and prosperous slave by remaining loyal and obedient; he is looked after well by his master. Uncle Tom, abused by the abolitionists he fled with, has since died, together with several other slaves who escaped to the North and found more oppression under the abolitionists than on the plantation.

https://en.wikipedia.org/wiki/Uncle_Robin%2C_in_His_Cabin_in_Virginia%2C_and_Tom_Without_One_in_Boston

Uncle Robin, in His Cabin in Virginia, and Tom Without One in Boston