 In 1918 , Jinnah married his second wife Rattanbai Petit ( " Ruttie " ) , 24 years his junior . She was the fashionable young daughter of his friend Sir Dinshaw Petit , of an elite Parsi family of Bombay . There was great opposition to the marriage from Rattanbai 's family and the Parsi community , as well as from some Muslim religious leaders . Rattanbai defied her family and nominally converted to Islam , adopting ( though never using ) the name Maryam Jinnah , resulting in a permanent estrangement from her family and Parsi society . The couple resided in Bombay , and frequently travelled across India and Europe . The couple 's only child , daughter Dina , was born on 15 August 1919 . The couple separated prior to Ruttie 's death in 1929 , and subsequently Jinnah 's sister Fatima looked after him and his child . 
