 Our Prophet sallallahu alayhi sallam, as is related in the Musnad of Imam Ahmad, that there are mysterious ways in which Allah ta'ala answers dua, but it's always answered. There's never a Muslim that makes a supplication to Allah. لَيْسَ فِيْهَا إِثْمْ وَلَا قَطِيعَ تَرْحِمْ So long as it does not entail any sinfulness or the breach of a family tie, except that Allah will give for that supplication in response, أَسْتَجِبْ لَكُمْ one of three things. Either Allah will immediately answer the supplication or the second possibility that Allah stores it for that person. In the third option that Allah will ward off from some harm the like of that supplication. قَالُوا تَكْسَ حَبَ رَضِلَ عَنْهُمْ جَمْيَنْ They said, in that case, we shall be plentiful in our supplication. O God's Messenger, sallallahu alayhi sallam.