Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
You don’t owe your toxic father anything other than occasional messages of good will, while keeping a reasonable distance from him.
Responding to your question, Sheikh Ahmad Kutty, a senior lecturer and an Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
I empathize with your situation and pray to Allah to bless you with relief and comfort. You definitely need to turn to Allah for His help through patience and prayer. You can do so by being diligent in your daily prayers and dhikr.
You should also continue your therapy and counseling to avoid falling into depression and overcome your emotional and mental challenges.
As for your duties towards your father, you are justified in keeping away from him. He forfeited his duties as a father towards you; instead, he abused you. Emotional abuse is worse than physical abuse. So, you have the right to protect yourself from him. Keeping a close relationship with him as if nothing happened will only aggravate the situation.
So, he not only failed in his duties towards you as a father but also abused you causing you unbearable trauma and emotional challenges.
Therefore, you don’t owe him anything other than occasional messages of good will, while keeping a reasonable distance from him.
I pray to Allah to grant you relief and strength to overcome your challenges and bless you with peace of mind and sound health.
Almighty Allah knows best.