The Prophet of Islam had only one daughter named Fatima. Her mother Khadija had two other daughters from her two earlier marriages. When The Prophet married her, both daughters came with her mother to live in the house of the Prophet.
Hazrat Fatima (R.A) was born five years before Bethat when Muhammad (S) was about 35 years old and her mother Khadija was about 50 years old. She has many other titles. Zahra (Lady of Light) and Sayyidatun Nisa al Alamin (Leader of the women of the worlds). The Date of her birth was 20th Jamad al Akhar.
After the death of her mother Khadija, she looked after her father the Prophet of Islam so devoutly that Muhammad (S) used to call her “Umme Abiha”, i.e. the mother her father. This was the hardest time for the family because in the same year Abu Talib who was the protector of Muhammad (S) from the animosity of the Quraish also died in the same year as Khadija.