Lady Danbury does not have a brother in the Bridgerton series. She has a nephew, Lord Featherington, who is the son of her late sister. Lady Danbury's relationship with him is often strained, as she sees him as a disappointment and a reflection of her sister's poor choices.
While Lady Danbury does not have a brother, the series does explore the complex dynamics of family relationships, showing how even the most powerful figures like Lady Danbury can struggle with their family members.