All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
We have already issued Fatwa to the Prophet ">91134 about the biography of Umm Haraam Bint Milhaan, so please refer to it.
Besides, some scholars, like Ibn ‘Abdul barr stated in his book “At-Tamheed” that she was a maternal aunt of the Prophet from suckling; this is what Al-‘Ayni reported in “‘Umdatul Qaari” from Ad-Dawoodi.
We have also clarified the stand of Ahlus-Sunnah in regard to Yazeed in Fatwa 104601, and there is no doubt that he had many faults, and the Hadeeth in which the Prophet said: ''The first army that will conquer Constantinople is forgiven.”, does not necessarily mean that Yazeed who was the leader of that army is forgiven, but Allaah may or may not forgive him, and the Hadeeth may have some specifications that exclude Yazeed and other people from the general wording of the Hadeeth. Moreover, we are not aware of a Saheeh [sound] Hadeeth which clarifies that he is from the people of Paradise.
As regards the Hadeeth which you pointed to in the question, it is the Hadeeth of Umm Haraam that she heard the Prophet saying: "The first army from my nation who will undertake a naval expedition are granted Paradise.” She [Umm Haraam] said, 'O Prophet of Allaah, will I be amongst them?' He () replied: “You are amongst them.” Then the Prophet said: ''The first army amongst my followers who will invade Caesar's city, their sins will be forgiven.” “I asked: “Will I be one of them, O, Prophet of Allaah?” He said: “No.” [Al-Bukhari]
Also, Umm Haraam said once the Prophet had a siesta in her home and he got up smiling. She [Umm Haraam] said: “What makes you smile; O Prophet of Allaah?' He replied: “I was surprised to see (i.e. in a dream) that some of my followers were sailing over this sea like kings on thrones.' She said: “O, Prophet of Allaah! Invoke Allaah to make me one of them." So, the Prophet () said: "You are among them." [Al-Bukhari and Muslim]
These Ahaadeeth are authentic and there is no doubt about them and it is enough that they were narrated either by both Al-Bukhari and Muslim or by one of them. Indeed, the Ahaadeeth of Al-Bukhari and Muslim both, were widely accepted by the whole Ummah, as mentioned by An-Nawawi and other scholars .
With regard to your request about a detailed analysis of these Ahaadeeth and their narrators, then we apologize for this as this can not be discussed in a Fatwa; however, what we mentioned about their authenticity is enough.
Concerning the people of Shaam [the Ancient Syria] who narrated the Hadeeth, then they are trustworthy people and they narrated it as they narrated many other Ahaadeeth. Who described them as being Naasibis (enemies of Ahlul-Bayt)? Was he one of the trustworthy scholars like Imaam Maalik and the like? The answer is ‘no’. Rather, these bad names came from innovators and it is easy to give bad names but this does not change the reality in anything.
Allaah Knows best.