My uncle is the person who has done most of this research, except for the story about the restaurant named "Dolberry's". The restaurant was burnt down and someone who worked with my work with my father in the Philadelphia Fire Department told him about the restaurant. In the archives, somewhere in Philadelphia, is where my uncle did most of his research. If you want, I can try to get him to contact you on the info that he has someway. He has been doing research on our family for many years.
He told me that the name switched for Delaberre to Dolberry when one of the sons in the slave trading family married a girl who was too "poor" for the family. The son was disowed because of his marriage and changed his name.