Question

امر و نهی (کردن) بیش از حد والدین اثر سوء در فرزندان خواهد داشت

Answer 1

Command-prohibition issued by parents will have a negative effect on children.

https://goo.gl/ozJQ1l

Comments

or:

commands and prohibitions issued by mother and father 

https://goo.gl/DVTTSO

Answer 2

امر و نهی کردن : 

boss around : http://idioms.thefreedictionary.com/boss+around

dictate to (someone) : http://www.thefreedictionary.com/dictate

order around : http://idioms.thefreedictionary.com/order+around

Parents dictating to the children what they should and should not do, will have negative effects on them. 

Answer 3

Harsh/excessive parental disciplining could have adverse effect/negative impact on children.

 

Harsh parental disciplining could adversely affect children.

 

too much discipline can cause ..........