Sewing versus buying clothes for her step-sons when vowing to sew them for them

Q: My mother made a vow that if I passed the exams of the first primary year, she would make my paternal half brothers some clothes. My half brothers are ten in number. My question is: Is it obligatory for my mother to make such clothes or she can buy ready-made clothes?

A: It is obligatory for your mother to fulfill her vow, as the Prophet (peace be upon him) said, Whoever vows to obey Allah should obey Him; and whoever vows to disobey Allah should not disobey Him. Thus, it is obligatory for her to clothe them whether by making such clothes or buying them ready-made. (Part No. 23; Page No. 333) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.