The Prophet ﷺ said: The intercession of a martyr will be accepted for seventy members of his family. Abu Dawud said: The correct name if the narrator is Rabah b. al-Walid (and not al-walid b. Rabah as occurred in the chain of narrators in the text of the tradition)  

دَخَلْنَا عَلَى أُمِّ الدَّرْدَاءِ وَنَحْنُ أَيْتَامٌ فَقَالَتْ أَبْشِرُوا فَإِنِّي سَمِعْتُ أَبَا الدَّرْدَاءِ يَقُولُ قَالَ رَسُولُ اللَّهِ ﷺ يُشَفَّعُ الشَّهِيدُ فِي سَبْعِينَ مِنْ أَهْلِ بَيْتِهِ