The Samajwadi Party (SP)’s patriarch Mulayam Singh Yadav’s younger daughter-in-law Aparna Yadav on Wednesday joined the Bharatiya Janata Party (BJP) at the party headquarters in Delhi. Aparna joined the BJP in the presence of deputy chief minister Keshav Prasad Maurya and Uttar Pradesh BJP president Swatantra Dev Singh, at the party headquarters in the national capital.