“Fatima (..), the daughter of the Holy Prophet (..), sent for Abu Bakr (after he became caliph following the death of the Holy Prophet (..) claiming from him her inheritance left for her by the Messenger of Allah from what Allah had bestowed (specifically) upon him in Medina and Fadak and what was left from the fifth (khums) of the income from Khaybar. Abu Bakr refused to hand over anything from it to Fatima (..).
Then, Fatima (..) became angry with Abu Bakr and forsook him and did not talk to him till the end of her life. When she died, her husband, Ali ibn Abu Talib, buried her at night. He did not inform Abu Bakr about herdeath and performed the funeral prayers for her personally”
(al-Bukhari, Vol. 5, p. 177; Vol. 8, p. 185; Muslim, Vol. 5, pp. 153-155; al-Bayhaqi, Vol. 4, p. 29; Vol. 6, pp. 300-301; Ibn Sa`d, Vol. 2, part 2, p. 86; Ahmed ibn Hanbal, Vol. 1, p. 9; al-Tabari, Vol. 1, p. 1825; Ibn Kathir, Tarikh, Vol. 5, pp. 285-286; Ibn Abul-Hadid, Vol. 6, p. 46 and Wafa’ al- Wafa’,Vol. 3, p. 995).
In this regard, Umm Ja`far, the daughter of Muhammad ibn Ja`far, narrated the following about the request of Fatima (..), who was nearing her death, to Asma’ daughter of `Umays: “When I die, I want you and Ali to wash me and do not allow anyone to go into my house.”
When she died, Aisha came to enter, but Asma’ said to her, “Do not enter.” Aisha complained to Abu Bakr (her father) saying, “This Khath’amiyya (woman from the tribe of Kath’am) intervenes between us and the daughter of the Messenger of Allah (..).” Abu Bakr came out, stood at the door and said, “O Asma’! What makes you prevent the wives of the Prophet (..) from entering to see the daughter of the Messenger of Allah?” Asma’ replied, “She had herself ordered me not to allow anyone to enter.” Abu Bakr said, “Do what she has ordered you”
(Hilyat al- Awliya’, Vol. 2, p. 43; Al-Sunan al-Kubra, Vol. 3, p. 396; Vol. 4, p. 334;Ansab al-Ashraf, Vol. 1, p. 405; Al-Isti`ab, Vol. 4, pp. 1897-1898; Usd al-Ghaba, Vol. 5, p. 524; Al-Isaba, Vol. 4, pp. 378-379).
Fatima (..) had also made a request to Imam Ali ibn Abu Talib (..) that she must be buried at night, that no one should come to her, that Abu Bakr and Umar should not be notified about her death and burial, and that
Abu Bakr should not be allowed to perform the funeral prayer for her.
When she died, Ali washed and buried her in the dark of the night without notifying Abu Bakr and Umar. So, these two were not aware of her burial.
Muhammad ibn Umar al-Waqidi (130/747-207/823) said the following: “It has been proven to us that Ali (..) performed her funeral prayers and buried her at night accompanied by al-Abbas (ibn Abdul- Muttalib) and (his son) al-Fadl and did not notify anyone.” It was for this reason that the burial place of Fatima (..) is hidden and is unknown, none alive is sure about it
(Al-Mustadrak, Vol. 3, pp. 162-163; Al-Musannaf, Vol. 4, p. 141; Ansab al-Ashraf, Vol. 1, pp. 402, 405; Al-Isti`ab, Vol. 4, p. 1898; Usd al-Ghaba, Vol. 5, pp. 524-525; Al- Isaba, Vol. 4, pp. 379-380; al-Tabari, Vol. 3, pp. 2435-2436; Ibn Sa`d, Vol. 8, pp. 19-20; Wafa’ al-Wafa’, Vol. 3, pp. 901-902, 904, 905; Ibn Abul-Hadid, Vol. 16, pp. 279-281).
Just curious Bibi Fatima (a.s) didn't talk to Abu bakar so why can't we just ignore some of our relatives?