Anas ibn Maalik said
“The Prophet of Allah, sallallaahu ‘alayhi wa sallam, never used to visit any woman, but visited their husbands, except for Umm Sulaym, he used to visit her [constantly]. When someone mentioned this to him about it, he said: ‘I feel compassion for her as her brother was killed following my orders and with my army.’
Umm Sulaym is Sahlah or Rumaylah, or Mulaykah, the daughter of Milhaan, and she was originally among the Ansaar. She was the mother of Anas ibn Maalik and was well known by her nickname.
Her brother, Haraam ibn Milhaan was killed in the battle of Bi’r Ma`oonah. The Prophet of Allah, sallallaahu ‘alayhi wa sallam, did not go out and participate in that battle, rather he ordered his army to go and fight.
Ibn Hajar said: “The Prophet of Allah, sallallaahu ‘alayhi wa sallam, consoled Umm Sulaym by visiting her, and he gave the reason for going to visit her, and that is that her brother was killed fighting for him. This narration shows us how the Prophet of Allah, sallallaahu ‘alayhi wa sallam, succeeded him in a good way with his family (took care of them), and that shows his good standing.