The Lajnah ad-Da’imah was asked the following question :
Is it permissible for a man to answer his mother while offering Salah (Prayer] whether it is obligatory or supererogatory?
If someone commences an obligatory Salah, he will not be permitted to interrupt it in order to answer his mother or father. However, if it is a supererogatory Salah, he will be permitted to interrupt it to answer his parents when there is a pressing need for that.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.
The Permanent Committee for Scholarly Research and Ifta’
Also there comes some narrations pertaining to this.
AbdulFattaah bin Uthman