"It is not permissible for a woman to mourn for anyone who dies for more than three days, except for her husband."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَحِلُّ لاِمْرَأَةٍ تَحِدُّ عَلَى مَيِّتٍ أَكْثَرَ مِنْ ثَلاَثٍ إِلاَّ عَلَى زَوْجِهَا  

"It is not permissible for a woman who believes in Allah and the Last Day to mourn for more than three days, except for her husband."  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ أَنْ تَحِدَّ فَوْقَ ثَلاَثَةِ أَيَّامٍ إِلاَّ عَلَى زَوْجٍ