Who are true brothers and true sisters?

_Ibn Hibbān Al-Bustī:_

*_"True brothers (or sisters) are known during times of need, for indeed everyone is a friend during the good times. And the worst of brothers (or sisters) are those that betray their brethren in times of hardship and need."_*

_Rawdat-ul-'Uqalā`, 221_

A reminder benefits the believer.