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Can Western culture advise if they believe the following to be acceptable. I was recently invited to a neighbours house for tea and this is what I witnessed.

Man of the House opens door when step daughter calls, as she enters he slaps her on her but and walks on. The step daughter says in front of Man's wife and myself, "and there is no need to do that" at the same time the step daughter hits him back on the but. The man of the house replies, no but it's nice to which the step daughter does not reply.

I would think what I witnessed is grossly unacceptable and disrespectful behaviour by the step father to his step daughter and the daughter's retaliation too.

Trying to understand why western people might think this is acceptable. Could you enlighten me please?

Also is there a governing body which controls this behaviour.

The step daughter was a mature woman.