What are the limits and methods for shunning a father who has religious transgressions and shows neglect towards his children, given the belief that shunning might lead to his improvement, and does this include not answering his calls and blocking him on social media?

We advise patience with your father, brothers, and sisters, and to counsel everyone with gentleness and wisdom, while striving to supplicate for them for success, righteousness, and avoidance of indecencies.

Regarding the abandonment of a disobedient father, please refer to fatwas: 137103 and 156934.