Hi Papa L,
Sam from the Stapleton here. I am writing to apologise to both you and your daughter for being asked to leave prematurely. We are licensed to have children on our premises until 7pm. What I am assuming has happened is that a supervisor asked a member of staff to remind you of this, giving you 30minutes grace. This has probably been misinterpreted by the staff member resulting in you being asked to leave then and there.
All staff have now been reminded of our policy, so please come and ask for me the next time you are in, as I feel a complimentary beverage is due to you for our error.