Identify Uninvited Individual from Supervised Visits

I need assistance in identifying a man who has been attending my daughter's supervised visits without authorization. This is urgent as my lawyer needs to subpoena him.

This project requires:
- Investigative skills to piece together my encounters and observations
- Ability to handle sensitive information discreetly
- Knowledge or experience in legal processes would be advantageous

I have no personal information about this individual but have noted:
- He was not supposed to be there
- Everyone is being very hush hush about it

Your task will be to assist me in identifying this individual and potentially gathering evidence for my lawyer.