Dear brother, Salam,
This is an intolerable crime. Abstain from taking the law into your hands.
Strong members of the family must take immediate and forceful action. Sexual abuse of women or children have the same punishment in the Qur'an. See Surah 33 verses 3:61-63.
The Mullahs and their blind followers almost invariably assert that the Qur’an prescribes no punishment for the rapist. Is it really so? Doesn’t the Qur’an claim to be a well perfected Book and that it covers all things that were necessary to be revealed. INNATTIBIYAANA LAKULLA SHAYI!
See how explicitly or implicitly RAPE is mentioned in the Qur'an. The verses remain obscure to Mullahs. Why? Because all five Imams of FIQH (Abu Hanifa, Malik, Shafi’i, Hanbal, Ja'far Sadiq) were seconded by the then emperors to ignore this atrocious crime and give a free hand to misogyny.
The Qur’an does not use ZINA-BIL-JABR (Forced sex) for good reason. Even bothering women on the street carries grievous punishment! The term used here derives from RAJF = Creating alarm = Bothering = Frightening = Harassing = Causing to tremble = Inciting fear. [33:59]
The punishment for men creating RAJF among women on the street could vary from exile to slaying depending on the extent and habit of RAJF caused by the accused.
33:60 Thus it is. If the hypocrites and they in whose hearts is a disease, and the alarmists in the City do not cease (to harass women), We indeed give you the authoritative mastery over them. Then they will be your neighbors no more than a short while. [See 33:59]
33:61 Accursed, they will be seized wherever found and slain one and all. (That is the penalty for men who keep annoying innocent women on the street, assault them or rape them).
33:62 That was the Way of Allah among those who lived before. And never will you find any change in Allah’s Way. (The Divine Laws in the Universe never change, and the Law of Requital never fails to requite).
In addition, rape being the most heinous crime of violence stands aside with creating corruption, disrupting the society and committing FASAD in the earth.
5:33 The just punishment for those who wage war against Allah and His Messenger and endeavor to commit bloody crimes on earth, is that they be killed or crucified, or have their hands and feet severed on alternate sides, or be entirely banished from the land. Such is their disgrace in this world, and an awful suffering awaits them in the Hereafter. [Banishing from the land indicates exile or imprisonment for life]