Is the questioner considered disobedient to his father for sometimes raising his voice at him? And did his father disobey him by depriving him and his sisters of seeing their mother and treating them harshly after his marriage? And is it permissible for the father to hide his wife's pregnancy from his children? And is it permissible for the children to be angry about this concealment? What is the best course of action to deal with this situation and with the sisters' sadness? And is it expected that the children's actions will be normal after all they have been through?

The father's mentioned actions are bad, and his preventing his children from maintaining ties with their mother is a severing of kinship ties, in which he is not to be obeyed. However, filial piety towards the father is obligatory, even if he falls short in his duty towards his children. Raising one's voice at the father is an act of disobedience (ʿuqūq) and a major sin that contradicts the noble verse: "So do not say to them [i.e., your parents], 'Uff,' and do not repel them." The son must make sincere repentance and seek his father's forgiveness. The father's preventing his children from seeing their mother is a shortcoming on his part, and it might fall under the disobedience of fathers towards their children. The second wife's attempt to sow discord between the father and his children is an act of corruption, and thwarting her is correct. The stepmother's pregnancy should not be a cause for dispute, and the children should strengthen their bond with their father and pray for him.