Praise be to Allaah.
We put this
question to Shaykh ‘Abd-Allaah ibn Jibreen, who replied:
They will no longer be counted as being alone together (khulwah) if there is a third person present with them, whether he is their child or someone else’s, and whether he is the child of zinaa or the child of a legitimate marriage – on the condition that he is above the age of discretion and is of sound mind, that there is no fear of fitnah, and that the woman is wearing full hijaab.
Sheikh Muhammed Salih Al-Munajjid