Union minister Amit Shah and Bengal Chief Minister Mamata Banerjee locked horns today in a fight that seems to be turning into a family brawl. On his day-long visit to Bengal, the home minister attacked her nephew and Trinamool MP Abhishek Banerjee, and Mamata Banerjee dragged his son into it. The BJP has attacked Abhishek Banerjee before. Mamata Banerjee's attack was a full-throttled first. Neither took any names in the squabble over 'B versus B' -- bhatija (nephew) versus beta (son).