Note what your objective should be. It is not to cast part of the blame on your brother but to admit your fault and make peace.
فَٱلْحِفَاظُ عَلَى ٱلسَّلَامِ مَعَ إِخْوَتِنَا هُوَ فَوْقَ كُلِّ ٱعْتِبَارٍ .‏