Is supplicating against the husband and his family—who deprived the mother of her infant daughter for a year—for God to remove blessings, joy, health, and life from them, to make their affliction in the loss of their children and their health, to shake and divide them, to sicken their bodies and disappoint their hopes, and to make an evil end their destiny—considered a supplication involving transgression and aggression?

If the husband and his family prevent the mother from seeing her daughter without a valid reason, it is permissible for her to supplicate against them without transgression. However, the supplication mentioned in the question contains transgression and is impermissible. Al-Qarafi says: "Where we affirmed the permissibility of supplicating against the oppressor, one should not supplicate against him with a painful worldly hardship that his transgression against you did not necessitate. For instance, if he commits a transgression against you, you should not supplicate against him with something greater than it, thereby becoming a transgressor against him by the excess amount. Allah Almighty says: {So, whoever commits aggression against you, then aggress against him in like measure as he aggressed against you}."

If she wishes to supplicate against them, it should be commensurate with their injustice without transgression. The safest approach is to say: "Allah is sufficient for us, and [He is] the best Disposer of affairs." It is better to refrain from supplicating against them and to be patient, as there is a great reward in patience. Imam Ahmad said: "Supplication is retribution. Whoever supplicates has not been patient," meaning, he has sought victory for himself. It is better to busy oneself with supplication for rectification and reform, and to strive to remove the injustice through lawful means, such as presenting the matter to a religious judge.