Hi again Ahcene,
Please try to be patient.
To be able to change a profile created by someone else you can request that Profile Manager to add you to the 'Trusted List'. This may mean that you have to be added to multiple profiles...... OR..... if your son removes his name from a profile then you can become the Profile Manager by 'adopting' the profile..... OR...... he can add you to the Trusted List and then remove his name as Profile Manager (if he wants to).
Also, please use this exact spelling of 'Unknown' in profile names (note the capital 'U'.
Hope this helps,