A vow to build a mosque, except that his parents are in need of the amount he would use to build the mosque; what is obligatory for him?

Question:
May Allah reward you with good and do you good. A listener says: My name is Samir al-Abd al-Razzaq. I am from Giza Governorate. I thought about traveling to Saudi Arabia for 'Umrah and I made a vow to Allah that if Allah blessed me with three thousand Egyptian pounds in the month, I would build a mosque for Allah in Egypt. However, I only received one thousand pounds after expenses. The family in Egypt needs every amount, and giving it to them is obedience to the parents, which is part of obedience to Allah. If I do not give it to them, they do not know that I have a vow. So what do you advise me to do now? May Allah reward you with good.

Answer:
There is no doubt that a vow is obligatory if one has the ability. The Prophet (peace and blessings be upon him) said: So if you have money that is in excess of your provisions and the provisions of those you are obligated to support, then you must fulfill this vow. If you do not have anything in excess of your own needs and the needs of those you support, then the vow remains a debt in your conscience to Allah until you are able to fulfill it. Yes.