Is it forbidden to obtain a master's scholarship without meeting the announced conditions, by means of the father's attempt to persuade officials to overlook the age and marriage conditions? And does the ruling differ if the father was unaware of the marriage?

The reference for the permissibility of receiving a grant is the donating entity. If they are aware of your situation and donate it to you as an exception due to your father's intercession, there is no harm, provided there is no deception towards the donating entity, such as not informing them of your marriage if it affects their donation. If the donating entity is from the public sector, it is stipulated that your exception does not prioritize you over someone more deserving of the grant than you.