If you are referring for supervised contact the staff will write a summary of what happened at the session. These are written into specific templates. As a professional a report can help you to do your work. Centres will often be happy to provide you with these so that you can use this information to help this family. Alternatively, it might also be possible for you to visit the centre and make your own observations.
Staff will record anything they consider relevant and this will often extend beyond just the session itself.
If you are unsure whether notes are being taken its ok to ask about this and the centre will be able to tell you if they are taking notes and who they will be sharing these with.
If you are referring for supported contact, the centre will not take notes or share information about the progress of the family at the centre. However, they will usually be able to share information about dates and times that your family use the centre, but they will not make any notes about what happens within the session itself. Alternatively, it might also be possible for you to visit the centre and make your own observations.