The children have no right or duty to raise their voice for their parents and they are not allowed to rake revenge for their inequity toward them. You are not allowed disagreeing with them nor fight with them, having conflict in the family is forbidden; instead, you must be patient and keep silent before your parents. The Holy Qur'an has never been content with the conflict in the family, but, unfortunately, this haram act is very rampant in the community.
source : erfan.ir
