Bismillah.
Narrated Abu Huraira:
Allah's Apostle said, "A woman called her son while he was in his hermitage and said, 'O Juraij' He said, 'O Allah, my mother (is calling me) and (I am offering) my prayer (what shall I do)?' She again said, 'O Juraij!' He said again, 'O Allah ! My mother (is calling me) and (I am offering) my prayer (what shall I do)?' She again said, 'O Juraij' He again said, 'O Allah! My mother (is calling me) and (I am offering) my prayer. (What shall I do?)' She said, 'O Allah! Do not let Juraij die till he sees the faces of prostitutes.' A shepherdess used to come by his hermitage for grazing her sheep and she gave birth to a child. She was asked whose child that was, and she replied that it was from Juraij and that he had come out from his hermitage. Juraij said, 'Where is that woman who claims that her child is from me?' (When she was brought to him along with the child), Juraij asked the child, 'O Babus, who is your father?' The child replied, 'The shepherd.' " (See Hadith No 662. Vol 3).
A longer version from Sahih Muslim here.
Juraij was from Bani Israel, just so you know. Commenting on this Hadith (Ibn Battaal), scholars have said that talking during prayer was not forbidden in Juraij's shari`ah (religious law). He could have answered his mother but he didn't. As to why and all the other questions in your mind, let's just not be judgmental. We get to know from the story that his mother's du`a against him was accepted, but Allah did bring out his innocence towards the end. And that's all there is to it.
In our shari`ah (Islam), talking during prayer was allowed before this ayah was revealed:
وَقُومُوا لِلَّهِ قَانِتِينَ
"And stand before Allah with obedience [and do not speak to others during the Salat (prayers)]." [Al-Baqarah: 238]
Now, if someone talks deliberately during prayer, his/her prayer in invalidated.
So what if your mom called you while you were praying? You won't answer her? :O
Yeah, you won't. Because Prophet (SAW) said:
Yeah, you won't. Because Prophet (SAW) said:
لا طاعة لمخلوق فى معصية الخالق
"There is no obedience to creation in disobedience to the Creator."
Meaning, if you respond to your mother's call during your prayer, you'll obey your mother but you'll disobey your Creator. And such obedience is not required. Allah has more rights on us than our parents.
Possible solution: make your prayer light (finish it early) and respond to your mother. (y)
Wassalam.