Kyunki Saas Bhi Kabhi Bahu Thi

In spite of Nandini's pleas, Karan refuses to oppose Tulsi and accepts her accusations. Even though Tulsi cries for hurting Karan, when he comes to take her blessings before leaving the Virani house, she asks him to transfer his property and bank balance to her. Why does Tulsi want Karan's assets?