Is it permissible to steal from one's father's business partner, who has been stealing for two years, by way of gaining what is rightfully due, such that the amount stolen is proportionate to the duration he has been stealing, rather than to the amount of money stolen?

The issue of seizing one's right arises when the right is established with certainty and denied, and there is no way to obtain it except through this method, with differences and details among scholars. Based on this, it is not permissible for the questioner's father – the rightful owner – to steal from his partner's money relying on the issue of seizing one's right.