Is the aforementioned act of fasting for 21 days, reciting the name of Allah, Al-Musawwir (The Fashioner), seven times, and blowing into water to drink after Iftar for the purpose of conception, sound in light of the Qur’an and Sunnah?

The image that the parents advised the husband to use is not part of ruqyah sharia (Islamic exorcism/healing) because it is not established in the Quran or Sunnah. It must be abandoned, and one should resort to ruqyah sharia and established supplications. It is permissible to supplicate with the beautiful names of Allah for the healing of illnesses, including infertility, as Allah Almighty says: "And to Allah belong the best names, so invoke Him by them" (Quran 7:180), and as the Prophet (peace be upon him) said: "Remove the suffering, O Lord of mankind, heal, for You are the Healer. There is no healing except Your healing." However, specifying a particular name of Allah for the purpose of healing, such as the name "Al-Musawwir" (The Fashioner), requires evidence. What is prescribed is for the supplicant to choose from the beautiful names what suits their request. Having children or not is in the hands of Allah Almighty, as He says: "To Allah belongs the dominion of the heavens and the earth; He creates what He wills. He gives to whom He wills female [children], and He gives to whom He wills males. Or He mixes them, males and females, and He renders whom He wills infertile. Indeed, He is Knowing and Competent" (Quran 42:49-50). The spouses should turn to Allah and ask Him for righteous offspring, persist in supplication, seek lawful medical treatment if there is an illness, and rely on Allah, being patient with His decree and destiny, for every matter of a believer is good for him.