Only son of woman's grandfather---Woman's father; Man's brother's sister---Man's father. So, man's father is woman's father i.e. woman is the man's sister.
Only son of Neena's father-in-law Mahipal---Neena's husband. So, Raman is Neena's husband and Anita and Bindu are his daughters. Thus, Bindu is the grand daughter of Mahipal.