South 24 Parganas (West Bengal) [India], January 25 (ANI): Trinamool Congress (TMC) MP Abhishek Banerjee, who is also state Chief Minister Mamata Banerjee's nephew on Sunday challenged the Bharatiya Janata Party (BJP) over dynastic politics and said he will quit happily if the latter brings a law mandating only one member from a family should stay in a particular political party.