What is the ruling on allowing a social worker, who assists the family, to park his car in the home's driveway to go watch sports matches that involve শরীয়াহ violations such as the uncovering of 'awrah, music, and intermixing? And does sin befall the one who permits him to do so? And what is the ruling on one who allows a person to use his personal computer to take an entrance exam for studies funded by a usurious loan? And is it obligatory to prevent those dealing with usurious loans from using a personal computer for study? And should the principle "Leave that which makes you doubt for that which does not make you doubt" be applied in these cases, even if it leads to conflict?

Aiding in sin is forbidden. Forbidden aid includes intentional or direct, immediate assistance. However, remote assistance, without intent, is not forbidden.

In summary, the types of aiding in sin and aggression are as follows: 1. Direct and intentional: Such as giving alcohol with the intention of assisting in its consumption. 2. Direct and unintentional: Such as selling forbidden items that have no permissible use, without the intention of assisting in the forbidden act. 3. Indirect and intentional: Such as giving money to buy alcohol. 4. Indirect and unintentional: Such as selling items that can be used for both permissible and forbidden purposes, without the intention of assisting in the forbidden act.

The first three types are forbidden, and the fourth is permissible, with the exception of cases where it is known or highly probable that the aided person will use it for sin.

Based on this: 1. Allowing an employee to park their car in your designated parking spot is not direct or immediate aid to sin; rather, it is remote and unintentional aid, so it is not forbidden. 2. There is no harm in allowing your relative to take a university entrance exam using your computer, even if they obtain their studies through an interest-based loan; this is because studying is permissible, and your assistance to them is for their studies, not for the loan. However, using your computer to obtain an interest-based loan is forbidden. 3. A benevolent loan (Qard Hasan) that stipulates a penalty for late payment is forbidden, because it is usury (riba).