How can one repent for making one's father look at a message that affected his spending, and how can one perform Ruqyah on the father's wealth after his death?

Children whose maintenance is obligatory upon their father have the right to take their necessities and needs from his wealth in a reasonable manner if he falls short in providing for them, even if it is without his knowledge, citing the hadith of Hind as proof. As for using "sihr al-atf" (magic of affection/sympathy), it is strictly forbidden, and it is prohibited to seek it or to approach anyone who performs it. Repentance from it is obligatory through remorse, a firm resolve not to return to it, and seeking forgiveness.