Does retracting a promise and oath to pay 500 Libyan dinars as a gift after a sister's graduation in architectural engineering, under the pretext of the high value and type of gift, knowing that another gift worth 100 dinars was given, and an attempt was made to pay the agreed-upon amount with the expectation of the sister's refusal, absolve one from breaking the oath? And what is the solution if it is not sufficient?

If someone swore to give his sister a gift upon her graduation, then he must either give her the gift or offer expiation for breaking an oath (kaffarat yameen). The obligation of the gift does not fall away because she does not need it or because he offers her another sum of money. If he gives her the gift and she returns it of her own free will without a prior agreement, then the oath is dissolved; otherwise, he must offer expiation for breaking an oath.