Is it legitimate for the family of the deceased to stand in a single line after the burial to receive condolences? And what is the evidence for that?

Consoling a Muslim in their affliction is recommended. Some scholars are of the view that it should be done before burial, while the majority of scholars hold that it should be done after burial, due to the deceased's family being preoccupied with preparing the body. However, it can be done before if the deceased's family shows extreme grief. After burial, it is recommended to stand by the grave and supplicate for the deceased for steadfastness, and the supplication should be made while standing. There is no harm in the deceased's relatives standing in a row for mourners to come and offer their condolences after the burial of their dead. Consolation can be offered from the moment of death, and whenever it occurs, it is valid. All types of people can be consoled, except for a young woman, whose consolation should be restricted to her mahrams. Standing to receive condolences after burial is not among the disliked sittings for consolation. Repeated consolation is not prescribed, based on the Prophet's (peace be upon him) saying: "The most rewarded visit [to the sick] is the lightest, and consolation is once."