Why is Margaret Drabble estranged from her sister Byatt?

Margaret Drabble and A.S. Byatt, both prominent British authors, have had a complicated relationship that has led to estrangement. Their rift stems from personal and professional differences, including contrasting literary styles and public personas. Additionally, Drabble has expressed concerns about Byatt's portrayal of their family dynamics in her writing, which may have further strained their relationship. Despite their shared literary background, their differing perspectives and experiences have resulted in a significant distance between them.