Sometimes it is the ones that have been there the longest that become our worst clients because they develop a air of entitlement.

That is kind of an unusual place to get bitten and then to not react when it happened to alert you. You don't say how old the child is but if they have been with you a long time assuming she is not a baby but able to tell you if something like that happens. Is it really a bite or just a bruise?

Plan of action for what ..... is child not able to tell you or to say no to a child bothering them or do you need to institute a head to toe search of child for bruises on arrival to protect yourself - some daycare centres actually do this and make the parent wait while it is done.

Sounds like dad is having a bad day and not really thinking straight. He may have underlying concerns about the development of his child in relation to peers - ie does she seem behind or too quiet or too sensitive or anything that sets her up to be bullied.

A child falling on a toy with corners will get "teeth" looking marks too so unless there is actual indents of teeth then doubt that she actually got bit - ever stepped on the corner of a block you will know what I mean. What makes him think she got bit?