and his parents who are unaware of it call him vaguely, he will have to reply to them even by breaking the Ṣalāĥ.’ (Derived from: Baĥār-e-Sharī’at, vol. 1, pp. 638) (However, it is Wājib to repeat that Nafl Ṣalāĥ afterwards).
Those who hurt the feelings of their parents by ignoring their call for no reason are severe sinner and deserve hellfire. The mother is after all a mother. If she curses her children even due to a misunderstanding during the moment when prayers are answered, offspring may get into trouble. In this regard, here is an admonitory parable of an Israeli pious man mentioned in the book of Ṣaḥīḥ Bukhārī: The Prophet of Raḥmaĥ, the Intercessor of Ummaĥ صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم has said, ‘There was a person named Jurayj in Banī Isrāīl. He was offering Ṣalāĥ when his mother came and called him, but he did not reply. He thought to himself, ‘Shall I offer Ṣalāĥ or reply to her?’ His mother came again (and cursed him because of not getting a reply from him), ‘O Allah عَزَّوَجَلَّ! Do not give him death until he sees the face of a fallen woman.’
[The Beloved and Blessed Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم further stated,] ‘One day, Jurayj was in the place of worship. A woman said, ‘I will seduce him.’ Hence, she came and started talking to Jurayj but he (Jurayj) refused. At last, she went to a shepherd and gave him control over herself. Therefore, she gave birth to a child and associated him with Jurayj. People came to Jurayj, broke his place of worship, turned him out and spoke ill of him.