Disciplining a partner’s child - is it acceptable or a no go area?

Wwe had an interesting message in from a listener who thinks it is unacceptable for her partner to discipline her 10 year old daughter.

It is a difficult situation when new partners meet your children. How far are they allowed to go when it comes to helping out with the children?

Is disciplining them out of the question? Or is it ever allowed?

See omnystudio.com/listener for privacy information.