There seems quite a few threads at the moment where the employer has some kind of problem with their childcare but they keep them on because the children like them. Sometimes that isn't enough. Kids will get attached to someone else. If you, the employer, isn't happy with your childcare - let them go. Make it better for everyone all round. If you don't 100% trust the person looking after the most precious person in your life, then why are they still there?